feat(web): add MCP HTTP endpoint with Streamable HTTP transport#976

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Merged
brendan-kellam merged 5 commits into from
Mar 4, 2026
Merged

feat(web): add MCP HTTP endpoint with Streamable HTTP transport #976

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49fc1b5
feat(web): add MCP HTTP endpoint with Streamable HTTP transport (SOU-…
brendan-kellam Mar 4, 2026
f2b5d1c
add method to apiHandler
brendan-kellam Mar 4, 2026
316b685
changelog
brendan-kellam Mar 4, 2026
425b7bf
feedback
brendan-kellam Mar 4, 2026
06c1906
feedback
brendan-kellam Mar 4, 2026
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3 changes: 3 additions & 0 deletions CHANGELOG.md
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Expand Up@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

## [Unreleased]

### Added
- Added support a MCP streamable http transport hosted at `/api/mcp`. [#976](https://github.com/sourcebot-dev/sourcebot/pull/976)

## [4.13.2] - 2026-03-02

### Changed
Expand Down
1 change: 1 addition & 0 deletions packages/web/package.json
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Expand Up@@ -59,6 +59,7 @@
"@hookform/resolvers": "^3.9.0",
"@iconify/react": "^5.1.0",
"@iizukak/codemirror-lang-wgsl": "^0.3.0",
"@modelcontextprotocol/sdk": "^1.27.1",
"@openrouter/ai-sdk-provider": "^2.2.3",
"@opentelemetry/api-logs": "^0.203.0",
"@opentelemetry/instrumentation": "^0.203.0",
Expand Down
12 changes: 8 additions & 4 deletions packages/web/src/app/[domain]/askgh/[owner]/[repo]/page.tsx
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@@ -1,13 +1,13 @@
import { addGithubRepo } from "@/features/workerApi/actions";
import { isServiceError, unwrapServiceError } from "@/lib/utils";
import { isServiceError } from "@/lib/utils";
import { ServiceErrorException } from "@/lib/serviceError";
import { prisma } from "@/prisma";
import { SINGLE_TENANT_ORG_ID } from "@/lib/constants";
import { getRepoInfo } from "./api";
import { CustomSlateEditor } from "@/features/chat/customSlateEditor";
import { RepoIndexedGuard } from "./components/repoIndexedGuard";
import { LandingPage } from "./components/landingPage";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { auth } from "@/auth";

interface PageProps {
Expand DownExpand Up@@ -45,8 +45,12 @@ export default async function GitHubRepoPage(props: PageProps) {
return response.repoId;
})();

const repoInfo = await unwrapServiceError(getRepoInfo(repoId));
const languageModels = await unwrapServiceError(getConfiguredLanguageModelsInfo());
const repoInfo = await getRepoInfo(repoId)
const languageModels = await getConfiguredLanguageModelsInfo()

if (isServiceError(repoInfo)) {
throw new ServiceErrorException(repoInfo);
}
Comment thread
brendan-kellam marked this conversation as resolved.

return (
<RepoIndexedGuard initialRepoInfo={repoInfo}>
Expand Down
2 changes: 1 addition & 1 deletion packages/web/src/app/[domain]/browse/layout.tsx
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@@ -1,6 +1,6 @@
import { auth } from "@/auth";
import { LayoutClient } from "./layoutClient";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";

interface LayoutProps {
children: React.ReactNode;
Expand Down
3 changes: 2 additions & 1 deletion packages/web/src/app/[domain]/chat/[id]/page.tsx
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@@ -1,5 +1,6 @@
import { getRepos, getSearchContexts } from '@/actions';
import { getUserChatHistory, getConfiguredLanguageModelsInfo, getChatInfo, claimAnonymousChats, getSharedWithUsersForChat } from '@/features/chat/actions';
import { getUserChatHistory, getChatInfo, claimAnonymousChats, getSharedWithUsersForChat } from '@/features/chat/actions';
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { ServiceErrorException } from '@/lib/serviceError';
import { isServiceError } from '@/lib/utils';
import { ChatThreadPanel } from './components/chatThreadPanel';
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3 changes: 2 additions & 1 deletion packages/web/src/app/[domain]/chat/page.tsx
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@@ -1,6 +1,7 @@
import { getRepos, getReposStats, getSearchContexts } from "@/actions";
import { SourcebotLogo } from "@/app/components/sourcebotLogo";
import { getConfiguredLanguageModelsInfo, getUserChatHistory } from "@/features/chat/actions";
import { getUserChatHistory } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { CustomSlateEditor } from "@/features/chat/customSlateEditor";
import { ServiceErrorException } from "@/lib/serviceError";
import { isServiceError, measure } from "@/lib/utils";
Expand Down
2 changes: 1 addition & 1 deletion packages/web/src/app/[domain]/search/page.tsx
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Expand Up@@ -2,7 +2,7 @@ import { env } from "@sourcebot/shared";
import { SearchLandingPage } from "./components/searchLandingPage";
import { SearchResultsPage } from "./components/searchResultsPage";
import { auth } from "@/auth";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";

interface SearchPageProps {
params: Promise<{ domain: string }>;
Expand Down
229 changes: 8 additions & 221 deletions packages/web/src/app/api/(server)/chat/blocking/route.ts
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@@ -1,23 +1,11 @@
import { sew } from "@/actions";
import { _getConfiguredLanguageModelsFull, _getAISDKLanguageModelAndOptions, _updateChatMessages, _generateChatNameFromMessage } from "@/features/chat/actions";
import { LanguageModelInfo, languageModelInfoSchema, SBChatMessage, SearchScope } from "@/features/chat/types";
import { convertLLMOutputToPortableMarkdown, getAnswerPartFromAssistantMessage, getLanguageModelKey } from "@/features/chat/utils";
import { ErrorCode } from "@/lib/errorCodes";
import { requestBodySchemaValidationError, ServiceError, ServiceErrorException, serviceErrorResponse } from "@/lib/serviceError";
import { askCodebase } from "@/features/mcp/askCodebase";
import { languageModelInfoSchema } from "@/features/chat/types";
import { apiHandler } from "@/lib/apiHandler";
import { requestBodySchemaValidationError, serviceErrorResponse } from "@/lib/serviceError";
import { isServiceError } from "@/lib/utils";
import { withOptionalAuthV2 } from "@/withAuthV2";
import { ChatVisibility, Prisma } from "@sourcebot/db";
import { createLogger, env } from "@sourcebot/shared";
import { randomUUID } from "crypto";
import { StatusCodes } from "http-status-codes";
import { ChatVisibility } from "@sourcebot/db";
import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { createMessageStream } from "../route";
import { InferUIMessageChunk, UITools, UIDataTypes, UIMessage } from "ai";
import { apiHandler } from "@/lib/apiHandler";
import { captureEvent } from "@/lib/posthog";

const logger = createLogger('chat-blocking-api');

/**
* Request schema for the blocking chat API.
Expand All@@ -40,22 +28,12 @@ const blockingChatRequestSchema = z.object({
.describe("The visibility of the chat session. If not provided, defaults to PRIVATE for authenticated users and PUBLIC for anonymous users. Set to PUBLIC to make the chat viewable by anyone with the link. Note: Anonymous users cannot create PRIVATE chats; any PRIVATE request from an unauthenticated user will be ignored and set to PUBLIC."),
});

/**
* Response schema for the blocking chat API.
*/
interface BlockingChatResponse {
answer: string;
chatId: string;
chatUrl: string;
languageModel: LanguageModelInfo;
}

/**
* POST /api/chat/blocking
*
*
* A blocking (non-streaming) chat endpoint designed for MCP and other integrations.
* Creates a chat session, runs the agent to completion, and returns the final answer.
*
*
* The chat session is persisted to the database, allowing users to view the full
* conversation (including tool calls and reasoning) in the web UI.
*/
Expand All@@ -67,202 +45,11 @@ export const POST = apiHandler(async (request: NextRequest) => {
return serviceErrorResponse(requestBodySchemaValidationError(parsed.error));
}

const { query, repos = [], languageModel: requestedLanguageModel, visibility: requestedVisibility } = parsed.data;

const response: BlockingChatResponse | ServiceError = await sew(() =>
withOptionalAuthV2(async ({ org, user, prisma }) => {
// Get all configured language models
const configuredModels = await _getConfiguredLanguageModelsFull();
if (configuredModels.length === 0) {
return {
statusCode: StatusCodes.BAD_REQUEST,
errorCode: ErrorCode.INVALID_REQUEST_BODY,
message: "No language models are configured. Please configure at least one language model. See: https://docs.sourcebot.dev/docs/configuration/language-model-providers",
} satisfies ServiceError;
}

// Use the requested language model if provided, otherwise default to the first configured model
let languageModelConfig = configuredModels[0];
if (requestedLanguageModel) {
const matchingModel = configuredModels.find(
(m) => getLanguageModelKey(m) === getLanguageModelKey(requestedLanguageModel as LanguageModelInfo)
);
if (!matchingModel) {
return {
statusCode: StatusCodes.BAD_REQUEST,
errorCode: ErrorCode.INVALID_REQUEST_BODY,
message: `Language model '${requestedLanguageModel.provider}/${requestedLanguageModel.model}' is not configured.`,
} satisfies ServiceError;
}
languageModelConfig = matchingModel;
}

const { model, providerOptions } = await _getAISDKLanguageModelAndOptions(languageModelConfig);
const modelName = languageModelConfig.displayName ?? languageModelConfig.model;

// Determine visibility: anonymous users cannot create private chats (they would be inaccessible)
// Only use requested visibility if user is authenticated, otherwise always use PUBLIC
const chatVisibility = (requestedVisibility && user)
? requestedVisibility
: (user ? ChatVisibility.PRIVATE : ChatVisibility.PUBLIC);

// Create a new chat session
const chat = await prisma.chat.create({
data: {
orgId: org.id,
createdById: user?.id,
visibility: chatVisibility,
messages: [] as unknown as Prisma.InputJsonValue,
},
});

await captureEvent('wa_chat_thread_created', {
chatId: chat.id,
isAnonymous: !user,
});

// Run the agent to completion
logger.debug(`Starting blocking agent for chat ${chat.id}`, {
chatId: chat.id,
query: query.substring(0, 100),
model: modelName,
});

// Create the initial user message
const userMessage: SBChatMessage = {
id: randomUUID(),
role: 'user',
parts: [{ type: 'text', text: query }],
};

const selectedRepos = (await Promise.all(repos.map(async (repo) => {
const repoDB = await prisma.repo.findFirst({
where: {
name: repo,
},
});

if (!repoDB) {
throw new ServiceErrorException({
statusCode: StatusCodes.BAD_REQUEST,
errorCode: ErrorCode.INVALID_REQUEST_BODY,
message: `Repository '${repo}' not found.`,
})
}

return {
type: 'repo',
value: repoDB.name,
name: repoDB.displayName ?? repoDB.name.split('/').pop() ?? repoDB.name,
codeHostType: repoDB.external_codeHostType,
} satisfies SearchScope;
})));

// We'll capture the final messages and usage from the stream
let finalMessages: SBChatMessage[] = [];

await captureEvent('wa_chat_message_sent', {
chatId: chat.id,
messageCount: 1,
selectedReposCount: selectedRepos.length,
...(env.EXPERIMENT_ASK_GH_ENABLED === 'true' ? {
selectedRepos: selectedRepos.map(r => r.value)
} : {}),
});

const stream = await createMessageStream({
chatId: chat.id,
messages: [userMessage],
metadata: {
selectedSearchScopes: selectedRepos,
},
selectedRepos: selectedRepos.map(r => r.value),
model,
modelName,
modelProviderOptions: providerOptions,
onFinish: async ({ messages }) => {
finalMessages = messages;
},
onError: (error) => {
if (error instanceof ServiceErrorException) {
throw error;
}

const message = error instanceof Error ? error.message : String(error);
throw new ServiceErrorException({
statusCode: StatusCodes.INTERNAL_SERVER_ERROR,
errorCode: ErrorCode.UNEXPECTED_ERROR,
message,
});
},
})

const [_, name] = await Promise.all([
// Consume the stream fully to trigger onFinish
blockStreamUntilFinish(stream),
// Generate and update the chat name
_generateChatNameFromMessage({
message: query,
languageModelConfig,
})
]);

// Persist the messages to the chat
await _updateChatMessages({ chatId: chat.id, messages: finalMessages, prisma });

// Update the chat name
await prisma.chat.update({
where: {
id: chat.id,
orgId: org.id,
},
data: {
name: name,
},
});

// Extract the answer text from the assistant message
const assistantMessage = finalMessages.find(m => m.role === 'assistant');
const answerPart = assistantMessage
? getAnswerPartFromAssistantMessage(assistantMessage, false)
: undefined;
const answerText = answerPart?.text ?? '';

// Build the base URL and chat URL
const baseUrl = env.AUTH_URL;

// Convert to portable markdown (replaces @file: references with markdown links)
const portableAnswer = convertLLMOutputToPortableMarkdown(answerText, baseUrl);
const chatUrl = `${baseUrl}/${org.domain}/chat/${chat.id}`;

logger.debug(`Completed blocking agent for chat ${chat.id}`, {
chatId: chat.id,
});

return {
answer: portableAnswer,
chatId: chat.id,
chatUrl,
languageModel: {
provider: languageModelConfig.provider,
model: languageModelConfig.model,
displayName: languageModelConfig.displayName,
},
} satisfies BlockingChatResponse;
})
);
const response = await askCodebase(parsed.data);

if (isServiceError(response)) {
return serviceErrorResponse(response);
}

return NextResponse.json(response);
});

const blockStreamUntilFinish = async <T extends UIMessage<unknown, UIDataTypes, UITools>>(stream: ReadableStream<InferUIMessageChunk<T>>) => {
const reader = stream.getReader();
while (true as const) {
const { done } = await reader.read();
if (done) break;
}
}
Loading
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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feat(web): add MCP HTTP endpoint with Streamable HTTP transport#976

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 Merged

brendan-kellam
merged 5 commits into

from

Mar 4, 2026
 Merged


feat(web): add MCP HTTP endpoint with Streamable HTTP transport
#976
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49fc1b5

feat(web): add MCP HTTP endpoint with Streamable HTTP transport (SOU-…


brendan-kellam Mar 4, 2026
f2b5d1c

add method to apiHandler


brendan-kellam Mar 4, 2026
316b685

changelog


brendan-kellam Mar 4, 2026
425b7bf

feedback


brendan-kellam Mar 4, 2026
06c1906

feedback


brendan-kellam Mar 4, 2026

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3 changes: 3 additions & 0 deletions
CHANGELOG.md

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Expand Up@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

## [Unreleased]

### Added
- Added support a MCP streamable http transport hosted at `/api/mcp`. [#976](https://github.com/sourcebot-dev/sourcebot/pull/976)

## [4.13.2] - 2026-03-02

### Changed
Expand Down

1 change: 1 addition & 0 deletions
packages/web/package.json

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Original file line numberDiff line numberDiff line change
Expand Up@@ -59,6 +59,7 @@
 "@hookform/resolvers": "^3.9.0",
 "@iconify/react": "^5.1.0",
 "@iizukak/codemirror-lang-wgsl": "^0.3.0",
 "@modelcontextprotocol/sdk": "^1.27.1",
 "@openrouter/ai-sdk-provider": "^2.2.3",
 "@opentelemetry/api-logs": "^0.203.0",
 "@opentelemetry/instrumentation": "^0.203.0",
Expand Down

12 changes: 8 additions & 4 deletions
packages/web/src/app/[domain]/askgh/[owner]/[repo]/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,13 +1,13 @@
import { addGithubRepo } from "@/features/workerApi/actions";
import { isServiceError, unwrapServiceError } from "@/lib/utils";
import { isServiceError } from "@/lib/utils";
import { ServiceErrorException } from "@/lib/serviceError";
import { prisma } from "@/prisma";
import { SINGLE_TENANT_ORG_ID } from "@/lib/constants";
import { getRepoInfo } from "./api";
import { CustomSlateEditor } from "@/features/chat/customSlateEditor";
import { RepoIndexedGuard } from "./components/repoIndexedGuard";
import { LandingPage } from "./components/landingPage";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { auth } from "@/auth";

interface PageProps {
Expand DownExpand Up@@ -45,8 +45,12 @@ export default async function GitHubRepoPage(props: PageProps) {
 return response.repoId;
 })();

 const repoInfo = await unwrapServiceError(getRepoInfo(repoId));
 const languageModels = await unwrapServiceError(getConfiguredLanguageModelsInfo());
 const repoInfo = await getRepoInfo(repoId)
 const languageModels = await getConfiguredLanguageModelsInfo()

 if (isServiceError(repoInfo)) {
 throw new ServiceErrorException(repoInfo);
 }
Comment thread
brendan-kellam marked this conversation as resolved.


 return (
 <RepoIndexedGuard initialRepoInfo={repoInfo}>
Expand Down

2 changes: 1 addition & 1 deletion
packages/web/src/app/[domain]/browse/layout.tsx

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@@ -1,6 +1,6 @@
import { auth } from "@/auth";
import { LayoutClient } from "./layoutClient";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";

interface LayoutProps {
 children: React.ReactNode;
Expand Down

3 changes: 2 additions & 1 deletion
packages/web/src/app/[domain]/chat/[id]/page.tsx

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@@ -1,5 +1,6 @@
import { getRepos, getSearchContexts } from '@/actions';
import { getUserChatHistory, getConfiguredLanguageModelsInfo, getChatInfo, claimAnonymousChats, getSharedWithUsersForChat } from '@/features/chat/actions';
import { getUserChatHistory, getChatInfo, claimAnonymousChats, getSharedWithUsersForChat } from '@/features/chat/actions';
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { ServiceErrorException } from '@/lib/serviceError';
import { isServiceError } from '@/lib/utils';
import { ChatThreadPanel } from './components/chatThreadPanel';
Expand Down

3 changes: 2 additions & 1 deletion
packages/web/src/app/[domain]/chat/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
import { getRepos, getReposStats, getSearchContexts } from "@/actions";
import { SourcebotLogo } from "@/app/components/sourcebotLogo";
import { getConfiguredLanguageModelsInfo, getUserChatHistory } from "@/features/chat/actions";
import { getUserChatHistory } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { CustomSlateEditor } from "@/features/chat/customSlateEditor";
import { ServiceErrorException } from "@/lib/serviceError";
import { isServiceError, measure } from "@/lib/utils";
Expand Down

2 changes: 1 addition & 1 deletion
packages/web/src/app/[domain]/search/page.tsx

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Expand Up@@ -2,7 +2,7 @@ import { env } from "@sourcebot/shared";
import { SearchLandingPage } from "./components/searchLandingPage";
import { SearchResultsPage } from "./components/searchResultsPage";
import { auth } from "@/auth";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";

interface SearchPageProps {
 params: Promise<{ domain: string }>;
Expand Down

229 changes: 8 additions & 221 deletions
packages/web/src/app/api/(server)/chat/blocking/route.ts

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@@ -1,23 +1,11 @@
import { sew } from "@/actions";
import { _getConfiguredLanguageModelsFull, _getAISDKLanguageModelAndOptions, _updateChatMessages, _generateChatNameFromMessage } from "@/features/chat/actions";
import { LanguageModelInfo, languageModelInfoSchema, SBChatMessage, SearchScope } from "@/features/chat/types";
import { convertLLMOutputToPortableMarkdown, getAnswerPartFromAssistantMessage, getLanguageModelKey } from "@/features/chat/utils";
import { ErrorCode } from "@/lib/errorCodes";
import { requestBodySchemaValidationError, ServiceError, ServiceErrorException, serviceErrorResponse } from "@/lib/serviceError";
import { askCodebase } from "@/features/mcp/askCodebase";
import { languageModelInfoSchema } from "@/features/chat/types";
import { apiHandler } from "@/lib/apiHandler";
import { requestBodySchemaValidationError, serviceErrorResponse } from "@/lib/serviceError";
import { isServiceError } from "@/lib/utils";
import { withOptionalAuthV2 } from "@/withAuthV2";
import { ChatVisibility, Prisma } from "@sourcebot/db";
import { createLogger, env } from "@sourcebot/shared";
import { randomUUID } from "crypto";
import { StatusCodes } from "http-status-codes";
import { ChatVisibility } from "@sourcebot/db";
import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { createMessageStream } from "../route";
import { InferUIMessageChunk, UITools, UIDataTypes, UIMessage } from "ai";
import { apiHandler } from "@/lib/apiHandler";
import { captureEvent } from "@/lib/posthog";

const logger = createLogger('chat-blocking-api');

/**
 * Request schema for the blocking chat API.
Expand All@@ -40,22 +28,12 @@ const blockingChatRequestSchema = z.object({
 .describe("The visibility of the chat session. If not provided, defaults to PRIVATE for authenticated users and PUBLIC for anonymous users. Set to PUBLIC to make the chat viewable by anyone with the link. Note: Anonymous users cannot create PRIVATE chats; any PRIVATE request from an unauthenticated user will be ignored and set to PUBLIC."),
});

/**
 * Response schema for the blocking chat API.
 */
interface BlockingChatResponse {
 answer: string;
 chatId: string;
 chatUrl: string;
 languageModel: LanguageModelInfo;
}

/**
 * POST /api/chat/blocking
 *
 *
 * A blocking (non-streaming) chat endpoint designed for MCP and other integrations.
 * Creates a chat session, runs the agent to completion, and returns the final answer.
 *
 *
 * The chat session is persisted to the database, allowing users to view the full
 * conversation (including tool calls and reasoning) in the web UI.
 */
Expand All@@ -67,202 +45,11 @@ export const POST = apiHandler(async (request: NextRequest) => {
 return serviceErrorResponse(requestBodySchemaValidationError(parsed.error));
 }

 const { query, repos = [], languageModel: requestedLanguageModel, visibility: requestedVisibility } = parsed.data;

 const response: BlockingChatResponse | ServiceError = await sew(() =>
 withOptionalAuthV2(async ({ org, user, prisma }) => {
 // Get all configured language models
 const configuredModels = await _getConfiguredLanguageModelsFull();
 if (configuredModels.length === 0) {
 return {
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: "No language models are configured. Please configure at least one language model. See: https://docs.sourcebot.dev/docs/configuration/language-model-providers",
 } satisfies ServiceError;
 }

 // Use the requested language model if provided, otherwise default to the first configured model
 let languageModelConfig = configuredModels[0];
 if (requestedLanguageModel) {
 const matchingModel = configuredModels.find(
 (m) => getLanguageModelKey(m) === getLanguageModelKey(requestedLanguageModel as LanguageModelInfo)
 );
 if (!matchingModel) {
 return {
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: `Language model '${requestedLanguageModel.provider}/${requestedLanguageModel.model}' is not configured.`,
 } satisfies ServiceError;
 }
 languageModelConfig = matchingModel;
 }

 const { model, providerOptions } = await _getAISDKLanguageModelAndOptions(languageModelConfig);
 const modelName = languageModelConfig.displayName ?? languageModelConfig.model;

 // Determine visibility: anonymous users cannot create private chats (they would be inaccessible)
 // Only use requested visibility if user is authenticated, otherwise always use PUBLIC
 const chatVisibility = (requestedVisibility && user)
 ? requestedVisibility
 : (user ? ChatVisibility.PRIVATE : ChatVisibility.PUBLIC);

 // Create a new chat session
 const chat = await prisma.chat.create({
 data: {
 orgId: org.id,
 createdById: user?.id,
 visibility: chatVisibility,
 messages: [] as unknown as Prisma.InputJsonValue,
 },
 });

 await captureEvent('wa_chat_thread_created', {
 chatId: chat.id,
 isAnonymous: !user,
 });

 // Run the agent to completion
 logger.debug(`Starting blocking agent for chat ${chat.id}`, {
 chatId: chat.id,
 query: query.substring(0, 100),
 model: modelName,
 });

 // Create the initial user message
 const userMessage: SBChatMessage = {
 id: randomUUID(),
 role: 'user',
 parts: [{ type: 'text', text: query }],
 };

 const selectedRepos = (await Promise.all(repos.map(async (repo) => {
 const repoDB = await prisma.repo.findFirst({
 where: {
 name: repo,
 },
 });

 if (!repoDB) {
 throw new ServiceErrorException({
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: `Repository '${repo}' not found.`,
 })
 }

 return {
 type: 'repo',
 value: repoDB.name,
 name: repoDB.displayName ?? repoDB.name.split('/').pop() ?? repoDB.name,
 codeHostType: repoDB.external_codeHostType,
 } satisfies SearchScope;
 })));

 // We'll capture the final messages and usage from the stream
 let finalMessages: SBChatMessage[] = [];

 await captureEvent('wa_chat_message_sent', {
 chatId: chat.id,
 messageCount: 1,
 selectedReposCount: selectedRepos.length,
 ...(env.EXPERIMENT_ASK_GH_ENABLED === 'true' ? {
 selectedRepos: selectedRepos.map(r => r.value)
 } : {}),
 });

 const stream = await createMessageStream({
 chatId: chat.id,
 messages: [userMessage],
 metadata: {
 selectedSearchScopes: selectedRepos,
 },
 selectedRepos: selectedRepos.map(r => r.value),
 model,
 modelName,
 modelProviderOptions: providerOptions,
 onFinish: async ({ messages }) => {
 finalMessages = messages;
 },
 onError: (error) => {
 if (error instanceof ServiceErrorException) {
 throw error;
 }

 const message = error instanceof Error ? error.message : String(error);
 throw new ServiceErrorException({
 statusCode: StatusCodes.INTERNAL_SERVER_ERROR,
 errorCode: ErrorCode.UNEXPECTED_ERROR,
 message,
 });
 },
 })

 const [_, name] = await Promise.all([
 // Consume the stream fully to trigger onFinish
 blockStreamUntilFinish(stream),
 // Generate and update the chat name
 _generateChatNameFromMessage({
 message: query,
 languageModelConfig,
 })
 ]);

 // Persist the messages to the chat
 await _updateChatMessages({ chatId: chat.id, messages: finalMessages, prisma });

 // Update the chat name
 await prisma.chat.update({
 where: {
 id: chat.id,
 orgId: org.id,
 },
 data: {
 name: name,
 },
 });

 // Extract the answer text from the assistant message
 const assistantMessage = finalMessages.find(m => m.role === 'assistant');
 const answerPart = assistantMessage
 ? getAnswerPartFromAssistantMessage(assistantMessage, false)
 : undefined;
 const answerText = answerPart?.text ?? '';

 // Build the base URL and chat URL
 const baseUrl = env.AUTH_URL;

 // Convert to portable markdown (replaces @file: references with markdown links)
 const portableAnswer = convertLLMOutputToPortableMarkdown(answerText, baseUrl);
 const chatUrl = `${baseUrl}/${org.domain}/chat/${chat.id}`;

 logger.debug(`Completed blocking agent for chat ${chat.id}`, {
 chatId: chat.id,
 });

 return {
 answer: portableAnswer,
 chatId: chat.id,
 chatUrl,
 languageModel: {
 provider: languageModelConfig.provider,
 model: languageModelConfig.model,
 displayName: languageModelConfig.displayName,
 },
 } satisfies BlockingChatResponse;
 })
 );
 const response = await askCodebase(parsed.data);

 if (isServiceError(response)) {
 return serviceErrorResponse(response);
 }

 return NextResponse.json(response);
});

const blockStreamUntilFinish = async <T extends UIMessage<unknown, UIDataTypes, UITools>>(stream: ReadableStream<InferUIMessageChunk<T>>) => {
 const reader = stream.getReader();
 while (true as const) {
 const { done } = await reader.read();
 if (done) break;
 }
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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feat(web): add MCP HTTP endpoint with Streamable HTTP transport#976

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 Merged

brendan-kellam
merged 5 commits into

from

Mar 4, 2026
 Merged


feat(web): add MCP HTTP endpoint with Streamable HTTP transport
#976
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49fc1b5

feat(web): add MCP HTTP endpoint with Streamable HTTP transport (SOU-…


brendan-kellam Mar 4, 2026
f2b5d1c

add method to apiHandler


brendan-kellam Mar 4, 2026
316b685

changelog


brendan-kellam Mar 4, 2026
425b7bf

feedback


brendan-kellam Mar 4, 2026
06c1906

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brendan-kellam Mar 4, 2026

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3 changes: 3 additions & 0 deletions
CHANGELOG.md

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Original file line numberDiff line numberDiff line change
Expand Up@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

## [Unreleased]

### Added
- Added support a MCP streamable http transport hosted at `/api/mcp`. [#976](https://github.com/sourcebot-dev/sourcebot/pull/976)

## [4.13.2] - 2026-03-02

### Changed
Expand Down

1 change: 1 addition & 0 deletions
packages/web/package.json

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Original file line numberDiff line numberDiff line change
Expand Up@@ -59,6 +59,7 @@
 "@hookform/resolvers": "^3.9.0",
 "@iconify/react": "^5.1.0",
 "@iizukak/codemirror-lang-wgsl": "^0.3.0",
 "@modelcontextprotocol/sdk": "^1.27.1",
 "@openrouter/ai-sdk-provider": "^2.2.3",
 "@opentelemetry/api-logs": "^0.203.0",
 "@opentelemetry/instrumentation": "^0.203.0",
Expand Down

12 changes: 8 additions & 4 deletions
packages/web/src/app/[domain]/askgh/[owner]/[repo]/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,13 +1,13 @@
import { addGithubRepo } from "@/features/workerApi/actions";
import { isServiceError, unwrapServiceError } from "@/lib/utils";
import { isServiceError } from "@/lib/utils";
import { ServiceErrorException } from "@/lib/serviceError";
import { prisma } from "@/prisma";
import { SINGLE_TENANT_ORG_ID } from "@/lib/constants";
import { getRepoInfo } from "./api";
import { CustomSlateEditor } from "@/features/chat/customSlateEditor";
import { RepoIndexedGuard } from "./components/repoIndexedGuard";
import { LandingPage } from "./components/landingPage";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { auth } from "@/auth";

interface PageProps {
Expand DownExpand Up@@ -45,8 +45,12 @@ export default async function GitHubRepoPage(props: PageProps) {
 return response.repoId;
 })();

 const repoInfo = await unwrapServiceError(getRepoInfo(repoId));
 const languageModels = await unwrapServiceError(getConfiguredLanguageModelsInfo());
 const repoInfo = await getRepoInfo(repoId)
 const languageModels = await getConfiguredLanguageModelsInfo()

 if (isServiceError(repoInfo)) {
 throw new ServiceErrorException(repoInfo);
 }
Comment thread
brendan-kellam marked this conversation as resolved.


 return (
 <RepoIndexedGuard initialRepoInfo={repoInfo}>
Expand Down

2 changes: 1 addition & 1 deletion
packages/web/src/app/[domain]/browse/layout.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
import { auth } from "@/auth";
import { LayoutClient } from "./layoutClient";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";

interface LayoutProps {
 children: React.ReactNode;
Expand Down

3 changes: 2 additions & 1 deletion
packages/web/src/app/[domain]/chat/[id]/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,5 +1,6 @@
import { getRepos, getSearchContexts } from '@/actions';
import { getUserChatHistory, getConfiguredLanguageModelsInfo, getChatInfo, claimAnonymousChats, getSharedWithUsersForChat } from '@/features/chat/actions';
import { getUserChatHistory, getChatInfo, claimAnonymousChats, getSharedWithUsersForChat } from '@/features/chat/actions';
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { ServiceErrorException } from '@/lib/serviceError';
import { isServiceError } from '@/lib/utils';
import { ChatThreadPanel } from './components/chatThreadPanel';
Expand Down

3 changes: 2 additions & 1 deletion
packages/web/src/app/[domain]/chat/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
import { getRepos, getReposStats, getSearchContexts } from "@/actions";
import { SourcebotLogo } from "@/app/components/sourcebotLogo";
import { getConfiguredLanguageModelsInfo, getUserChatHistory } from "@/features/chat/actions";
import { getUserChatHistory } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { CustomSlateEditor } from "@/features/chat/customSlateEditor";
import { ServiceErrorException } from "@/lib/serviceError";
import { isServiceError, measure } from "@/lib/utils";
Expand Down

2 changes: 1 addition & 1 deletion
packages/web/src/app/[domain]/search/page.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -2,7 +2,7 @@ import { env } from "@sourcebot/shared";
import { SearchLandingPage } from "./components/searchLandingPage";
import { SearchResultsPage } from "./components/searchResultsPage";
import { auth } from "@/auth";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";

interface SearchPageProps {
 params: Promise<{ domain: string }>;
Expand Down

229 changes: 8 additions & 221 deletions
packages/web/src/app/api/(server)/chat/blocking/route.ts

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Original file line numberDiff line numberDiff line change
@@ -1,23 +1,11 @@
import { sew } from "@/actions";
import { _getConfiguredLanguageModelsFull, _getAISDKLanguageModelAndOptions, _updateChatMessages, _generateChatNameFromMessage } from "@/features/chat/actions";
import { LanguageModelInfo, languageModelInfoSchema, SBChatMessage, SearchScope } from "@/features/chat/types";
import { convertLLMOutputToPortableMarkdown, getAnswerPartFromAssistantMessage, getLanguageModelKey } from "@/features/chat/utils";
import { ErrorCode } from "@/lib/errorCodes";
import { requestBodySchemaValidationError, ServiceError, ServiceErrorException, serviceErrorResponse } from "@/lib/serviceError";
import { askCodebase } from "@/features/mcp/askCodebase";
import { languageModelInfoSchema } from "@/features/chat/types";
import { apiHandler } from "@/lib/apiHandler";
import { requestBodySchemaValidationError, serviceErrorResponse } from "@/lib/serviceError";
import { isServiceError } from "@/lib/utils";
import { withOptionalAuthV2 } from "@/withAuthV2";
import { ChatVisibility, Prisma } from "@sourcebot/db";
import { createLogger, env } from "@sourcebot/shared";
import { randomUUID } from "crypto";
import { StatusCodes } from "http-status-codes";
import { ChatVisibility } from "@sourcebot/db";
import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { createMessageStream } from "../route";
import { InferUIMessageChunk, UITools, UIDataTypes, UIMessage } from "ai";
import { apiHandler } from "@/lib/apiHandler";
import { captureEvent } from "@/lib/posthog";

const logger = createLogger('chat-blocking-api');

/**
 * Request schema for the blocking chat API.
Expand All@@ -40,22 +28,12 @@ const blockingChatRequestSchema = z.object({
 .describe("The visibility of the chat session. If not provided, defaults to PRIVATE for authenticated users and PUBLIC for anonymous users. Set to PUBLIC to make the chat viewable by anyone with the link. Note: Anonymous users cannot create PRIVATE chats; any PRIVATE request from an unauthenticated user will be ignored and set to PUBLIC."),
});

/**
 * Response schema for the blocking chat API.
 */
interface BlockingChatResponse {
 answer: string;
 chatId: string;
 chatUrl: string;
 languageModel: LanguageModelInfo;
}

/**
 * POST /api/chat/blocking
 *
 *
 * A blocking (non-streaming) chat endpoint designed for MCP and other integrations.
 * Creates a chat session, runs the agent to completion, and returns the final answer.
 *
 *
 * The chat session is persisted to the database, allowing users to view the full
 * conversation (including tool calls and reasoning) in the web UI.
 */
Expand All@@ -67,202 +45,11 @@ export const POST = apiHandler(async (request: NextRequest) => {
 return serviceErrorResponse(requestBodySchemaValidationError(parsed.error));
 }

 const { query, repos = [], languageModel: requestedLanguageModel, visibility: requestedVisibility } = parsed.data;

 const response: BlockingChatResponse | ServiceError = await sew(() =>
 withOptionalAuthV2(async ({ org, user, prisma }) => {
 // Get all configured language models
 const configuredModels = await _getConfiguredLanguageModelsFull();
 if (configuredModels.length === 0) {
 return {
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: "No language models are configured. Please configure at least one language model. See: https://docs.sourcebot.dev/docs/configuration/language-model-providers",
 } satisfies ServiceError;
 }

 // Use the requested language model if provided, otherwise default to the first configured model
 let languageModelConfig = configuredModels[0];
 if (requestedLanguageModel) {
 const matchingModel = configuredModels.find(
 (m) => getLanguageModelKey(m) === getLanguageModelKey(requestedLanguageModel as LanguageModelInfo)
 );
 if (!matchingModel) {
 return {
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: `Language model '${requestedLanguageModel.provider}/${requestedLanguageModel.model}' is not configured.`,
 } satisfies ServiceError;
 }
 languageModelConfig = matchingModel;
 }

 const { model, providerOptions } = await _getAISDKLanguageModelAndOptions(languageModelConfig);
 const modelName = languageModelConfig.displayName ?? languageModelConfig.model;

 // Determine visibility: anonymous users cannot create private chats (they would be inaccessible)
 // Only use requested visibility if user is authenticated, otherwise always use PUBLIC
 const chatVisibility = (requestedVisibility && user)
 ? requestedVisibility
 : (user ? ChatVisibility.PRIVATE : ChatVisibility.PUBLIC);

 // Create a new chat session
 const chat = await prisma.chat.create({
 data: {
 orgId: org.id,
 createdById: user?.id,
 visibility: chatVisibility,
 messages: [] as unknown as Prisma.InputJsonValue,
 },
 });

 await captureEvent('wa_chat_thread_created', {
 chatId: chat.id,
 isAnonymous: !user,
 });

 // Run the agent to completion
 logger.debug(`Starting blocking agent for chat ${chat.id}`, {
 chatId: chat.id,
 query: query.substring(0, 100),
 model: modelName,
 });

 // Create the initial user message
 const userMessage: SBChatMessage = {
 id: randomUUID(),
 role: 'user',
 parts: [{ type: 'text', text: query }],
 };

 const selectedRepos = (await Promise.all(repos.map(async (repo) => {
 const repoDB = await prisma.repo.findFirst({
 where: {
 name: repo,
 },
 });

 if (!repoDB) {
 throw new ServiceErrorException({
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: `Repository '${repo}' not found.`,
 })
 }

 return {
 type: 'repo',
 value: repoDB.name,
 name: repoDB.displayName ?? repoDB.name.split('/').pop() ?? repoDB.name,
 codeHostType: repoDB.external_codeHostType,
 } satisfies SearchScope;
 })));

 // We'll capture the final messages and usage from the stream
 let finalMessages: SBChatMessage[] = [];

 await captureEvent('wa_chat_message_sent', {
 chatId: chat.id,
 messageCount: 1,
 selectedReposCount: selectedRepos.length,
 ...(env.EXPERIMENT_ASK_GH_ENABLED === 'true' ? {
 selectedRepos: selectedRepos.map(r => r.value)
 } : {}),
 });

 const stream = await createMessageStream({
 chatId: chat.id,
 messages: [userMessage],
 metadata: {
 selectedSearchScopes: selectedRepos,
 },
 selectedRepos: selectedRepos.map(r => r.value),
 model,
 modelName,
 modelProviderOptions: providerOptions,
 onFinish: async ({ messages }) => {
 finalMessages = messages;
 },
 onError: (error) => {
 if (error instanceof ServiceErrorException) {
 throw error;
 }

 const message = error instanceof Error ? error.message : String(error);
 throw new ServiceErrorException({
 statusCode: StatusCodes.INTERNAL_SERVER_ERROR,
 errorCode: ErrorCode.UNEXPECTED_ERROR,
 message,
 });
 },
 })

 const [_, name] = await Promise.all([
 // Consume the stream fully to trigger onFinish
 blockStreamUntilFinish(stream),
 // Generate and update the chat name
 _generateChatNameFromMessage({
 message: query,
 languageModelConfig,
 })
 ]);

 // Persist the messages to the chat
 await _updateChatMessages({ chatId: chat.id, messages: finalMessages, prisma });

 // Update the chat name
 await prisma.chat.update({
 where: {
 id: chat.id,
 orgId: org.id,
 },
 data: {
 name: name,
 },
 });

 // Extract the answer text from the assistant message
 const assistantMessage = finalMessages.find(m => m.role === 'assistant');
 const answerPart = assistantMessage
 ? getAnswerPartFromAssistantMessage(assistantMessage, false)
 : undefined;
 const answerText = answerPart?.text ?? '';

 // Build the base URL and chat URL
 const baseUrl = env.AUTH_URL;

 // Convert to portable markdown (replaces @file: references with markdown links)
 const portableAnswer = convertLLMOutputToPortableMarkdown(answerText, baseUrl);
 const chatUrl = `${baseUrl}/${org.domain}/chat/${chat.id}`;

 logger.debug(`Completed blocking agent for chat ${chat.id}`, {
 chatId: chat.id,
 });

 return {
 answer: portableAnswer,
 chatId: chat.id,
 chatUrl,
 languageModel: {
 provider: languageModelConfig.provider,
 model: languageModelConfig.model,
 displayName: languageModelConfig.displayName,
 },
 } satisfies BlockingChatResponse;
 })
 );
 const response = await askCodebase(parsed.data);

 if (isServiceError(response)) {
 return serviceErrorResponse(response);
 }

 return NextResponse.json(response);
});

const blockStreamUntilFinish = async <T extends UIMessage<unknown, UIDataTypes, UITools>>(stream: ReadableStream<InferUIMessageChunk<T>>) => {
 const reader = stream.getReader();
 while (true as const) {
 const { done } = await reader.read();
 if (done) break;
 }
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
feat(web): add MCP HTTP endpoint with Streamable HTTP transport#976

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 Merged

brendan-kellam
merged 5 commits into

from

Mar 4, 2026
 Merged


feat(web): add MCP HTTP endpoint with Streamable HTTP transport
#976
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49fc1b5

feat(web): add MCP HTTP endpoint with Streamable HTTP transport (SOU-…


brendan-kellam Mar 4, 2026
f2b5d1c

add method to apiHandler


brendan-kellam Mar 4, 2026
316b685

changelog


brendan-kellam Mar 4, 2026
425b7bf

feedback


brendan-kellam Mar 4, 2026
06c1906

feedback


brendan-kellam Mar 4, 2026

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3 changes: 3 additions & 0 deletions
CHANGELOG.md

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

## [Unreleased]

### Added
- Added support a MCP streamable http transport hosted at `/api/mcp`. [#976](https://github.com/sourcebot-dev/sourcebot/pull/976)

## [4.13.2] - 2026-03-02

### Changed
Expand Down

1 change: 1 addition & 0 deletions
packages/web/package.json

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -59,6 +59,7 @@
 "@hookform/resolvers": "^3.9.0",
 "@iconify/react": "^5.1.0",
 "@iizukak/codemirror-lang-wgsl": "^0.3.0",
 "@modelcontextprotocol/sdk": "^1.27.1",
 "@openrouter/ai-sdk-provider": "^2.2.3",
 "@opentelemetry/api-logs": "^0.203.0",
 "@opentelemetry/instrumentation": "^0.203.0",
Expand Down

12 changes: 8 additions & 4 deletions
packages/web/src/app/[domain]/askgh/[owner]/[repo]/page.tsx

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,13 +1,13 @@
import { addGithubRepo } from "@/features/workerApi/actions";
import { isServiceError, unwrapServiceError } from "@/lib/utils";
import { isServiceError } from "@/lib/utils";
import { ServiceErrorException } from "@/lib/serviceError";
import { prisma } from "@/prisma";
import { SINGLE_TENANT_ORG_ID } from "@/lib/constants";
import { getRepoInfo } from "./api";
import { CustomSlateEditor } from "@/features/chat/customSlateEditor";
import { RepoIndexedGuard } from "./components/repoIndexedGuard";
import { LandingPage } from "./components/landingPage";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { auth } from "@/auth";

interface PageProps {
Expand DownExpand Up@@ -45,8 +45,12 @@ export default async function GitHubRepoPage(props: PageProps) {
 return response.repoId;
 })();

 const repoInfo = await unwrapServiceError(getRepoInfo(repoId));
 const languageModels = await unwrapServiceError(getConfiguredLanguageModelsInfo());
 const repoInfo = await getRepoInfo(repoId)
 const languageModels = await getConfiguredLanguageModelsInfo()

 if (isServiceError(repoInfo)) {
 throw new ServiceErrorException(repoInfo);
 }
Comment thread
brendan-kellam marked this conversation as resolved.


 return (
 <RepoIndexedGuard initialRepoInfo={repoInfo}>
Expand Down

2 changes: 1 addition & 1 deletion
packages/web/src/app/[domain]/browse/layout.tsx

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@@ -1,6 +1,6 @@
import { auth } from "@/auth";
import { LayoutClient } from "./layoutClient";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";

interface LayoutProps {
 children: React.ReactNode;
Expand Down

3 changes: 2 additions & 1 deletion
packages/web/src/app/[domain]/chat/[id]/page.tsx

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@@ -1,5 +1,6 @@
import { getRepos, getSearchContexts } from '@/actions';
import { getUserChatHistory, getConfiguredLanguageModelsInfo, getChatInfo, claimAnonymousChats, getSharedWithUsersForChat } from '@/features/chat/actions';
import { getUserChatHistory, getChatInfo, claimAnonymousChats, getSharedWithUsersForChat } from '@/features/chat/actions';
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { ServiceErrorException } from '@/lib/serviceError';
import { isServiceError } from '@/lib/utils';
import { ChatThreadPanel } from './components/chatThreadPanel';
Expand Down

3 changes: 2 additions & 1 deletion
packages/web/src/app/[domain]/chat/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
import { getRepos, getReposStats, getSearchContexts } from "@/actions";
import { SourcebotLogo } from "@/app/components/sourcebotLogo";
import { getConfiguredLanguageModelsInfo, getUserChatHistory } from "@/features/chat/actions";
import { getUserChatHistory } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { CustomSlateEditor } from "@/features/chat/customSlateEditor";
import { ServiceErrorException } from "@/lib/serviceError";
import { isServiceError, measure } from "@/lib/utils";
Expand Down

2 changes: 1 addition & 1 deletion
packages/web/src/app/[domain]/search/page.tsx

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Expand Up@@ -2,7 +2,7 @@ import { env } from "@sourcebot/shared";
import { SearchLandingPage } from "./components/searchLandingPage";
import { SearchResultsPage } from "./components/searchResultsPage";
import { auth } from "@/auth";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";

interface SearchPageProps {
 params: Promise<{ domain: string }>;
Expand Down

229 changes: 8 additions & 221 deletions
packages/web/src/app/api/(server)/chat/blocking/route.ts

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@@ -1,23 +1,11 @@
import { sew } from "@/actions";
import { _getConfiguredLanguageModelsFull, _getAISDKLanguageModelAndOptions, _updateChatMessages, _generateChatNameFromMessage } from "@/features/chat/actions";
import { LanguageModelInfo, languageModelInfoSchema, SBChatMessage, SearchScope } from "@/features/chat/types";
import { convertLLMOutputToPortableMarkdown, getAnswerPartFromAssistantMessage, getLanguageModelKey } from "@/features/chat/utils";
import { ErrorCode } from "@/lib/errorCodes";
import { requestBodySchemaValidationError, ServiceError, ServiceErrorException, serviceErrorResponse } from "@/lib/serviceError";
import { askCodebase } from "@/features/mcp/askCodebase";
import { languageModelInfoSchema } from "@/features/chat/types";
import { apiHandler } from "@/lib/apiHandler";
import { requestBodySchemaValidationError, serviceErrorResponse } from "@/lib/serviceError";
import { isServiceError } from "@/lib/utils";
import { withOptionalAuthV2 } from "@/withAuthV2";
import { ChatVisibility, Prisma } from "@sourcebot/db";
import { createLogger, env } from "@sourcebot/shared";
import { randomUUID } from "crypto";
import { StatusCodes } from "http-status-codes";
import { ChatVisibility } from "@sourcebot/db";
import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { createMessageStream } from "../route";
import { InferUIMessageChunk, UITools, UIDataTypes, UIMessage } from "ai";
import { apiHandler } from "@/lib/apiHandler";
import { captureEvent } from "@/lib/posthog";

const logger = createLogger('chat-blocking-api');

/**
 * Request schema for the blocking chat API.
Expand All@@ -40,22 +28,12 @@ const blockingChatRequestSchema = z.object({
 .describe("The visibility of the chat session. If not provided, defaults to PRIVATE for authenticated users and PUBLIC for anonymous users. Set to PUBLIC to make the chat viewable by anyone with the link. Note: Anonymous users cannot create PRIVATE chats; any PRIVATE request from an unauthenticated user will be ignored and set to PUBLIC."),
});

/**
 * Response schema for the blocking chat API.
 */
interface BlockingChatResponse {
 answer: string;
 chatId: string;
 chatUrl: string;
 languageModel: LanguageModelInfo;
}

/**
 * POST /api/chat/blocking
 *
 *
 * A blocking (non-streaming) chat endpoint designed for MCP and other integrations.
 * Creates a chat session, runs the agent to completion, and returns the final answer.
 *
 *
 * The chat session is persisted to the database, allowing users to view the full
 * conversation (including tool calls and reasoning) in the web UI.
 */
Expand All@@ -67,202 +45,11 @@ export const POST = apiHandler(async (request: NextRequest) => {
 return serviceErrorResponse(requestBodySchemaValidationError(parsed.error));
 }

 const { query, repos = [], languageModel: requestedLanguageModel, visibility: requestedVisibility } = parsed.data;

 const response: BlockingChatResponse | ServiceError = await sew(() =>
 withOptionalAuthV2(async ({ org, user, prisma }) => {
 // Get all configured language models
 const configuredModels = await _getConfiguredLanguageModelsFull();
 if (configuredModels.length === 0) {
 return {
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: "No language models are configured. Please configure at least one language model. See: https://docs.sourcebot.dev/docs/configuration/language-model-providers",
 } satisfies ServiceError;
 }

 // Use the requested language model if provided, otherwise default to the first configured model
 let languageModelConfig = configuredModels[0];
 if (requestedLanguageModel) {
 const matchingModel = configuredModels.find(
 (m) => getLanguageModelKey(m) === getLanguageModelKey(requestedLanguageModel as LanguageModelInfo)
 );
 if (!matchingModel) {
 return {
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: `Language model '${requestedLanguageModel.provider}/${requestedLanguageModel.model}' is not configured.`,
 } satisfies ServiceError;
 }
 languageModelConfig = matchingModel;
 }

 const { model, providerOptions } = await _getAISDKLanguageModelAndOptions(languageModelConfig);
 const modelName = languageModelConfig.displayName ?? languageModelConfig.model;

 // Determine visibility: anonymous users cannot create private chats (they would be inaccessible)
 // Only use requested visibility if user is authenticated, otherwise always use PUBLIC
 const chatVisibility = (requestedVisibility && user)
 ? requestedVisibility
 : (user ? ChatVisibility.PRIVATE : ChatVisibility.PUBLIC);

 // Create a new chat session
 const chat = await prisma.chat.create({
 data: {
 orgId: org.id,
 createdById: user?.id,
 visibility: chatVisibility,
 messages: [] as unknown as Prisma.InputJsonValue,
 },
 });

 await captureEvent('wa_chat_thread_created', {
 chatId: chat.id,
 isAnonymous: !user,
 });

 // Run the agent to completion
 logger.debug(`Starting blocking agent for chat ${chat.id}`, {
 chatId: chat.id,
 query: query.substring(0, 100),
 model: modelName,
 });

 // Create the initial user message
 const userMessage: SBChatMessage = {
 id: randomUUID(),
 role: 'user',
 parts: [{ type: 'text', text: query }],
 };

 const selectedRepos = (await Promise.all(repos.map(async (repo) => {
 const repoDB = await prisma.repo.findFirst({
 where: {
 name: repo,
 },
 });

 if (!repoDB) {
 throw new ServiceErrorException({
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: `Repository '${repo}' not found.`,
 })
 }

 return {
 type: 'repo',
 value: repoDB.name,
 name: repoDB.displayName ?? repoDB.name.split('/').pop() ?? repoDB.name,
 codeHostType: repoDB.external_codeHostType,
 } satisfies SearchScope;
 })));

 // We'll capture the final messages and usage from the stream
 let finalMessages: SBChatMessage[] = [];

 await captureEvent('wa_chat_message_sent', {
 chatId: chat.id,
 messageCount: 1,
 selectedReposCount: selectedRepos.length,
 ...(env.EXPERIMENT_ASK_GH_ENABLED === 'true' ? {
 selectedRepos: selectedRepos.map(r => r.value)
 } : {}),
 });

 const stream = await createMessageStream({
 chatId: chat.id,
 messages: [userMessage],
 metadata: {
 selectedSearchScopes: selectedRepos,
 },
 selectedRepos: selectedRepos.map(r => r.value),
 model,
 modelName,
 modelProviderOptions: providerOptions,
 onFinish: async ({ messages }) => {
 finalMessages = messages;
 },
 onError: (error) => {
 if (error instanceof ServiceErrorException) {
 throw error;
 }

 const message = error instanceof Error ? error.message : String(error);
 throw new ServiceErrorException({
 statusCode: StatusCodes.INTERNAL_SERVER_ERROR,
 errorCode: ErrorCode.UNEXPECTED_ERROR,
 message,
 });
 },
 })

 const [_, name] = await Promise.all([
 // Consume the stream fully to trigger onFinish
 blockStreamUntilFinish(stream),
 // Generate and update the chat name
 _generateChatNameFromMessage({
 message: query,
 languageModelConfig,
 })
 ]);

 // Persist the messages to the chat
 await _updateChatMessages({ chatId: chat.id, messages: finalMessages, prisma });

 // Update the chat name
 await prisma.chat.update({
 where: {
 id: chat.id,
 orgId: org.id,
 },
 data: {
 name: name,
 },
 });

 // Extract the answer text from the assistant message
 const assistantMessage = finalMessages.find(m => m.role === 'assistant');
 const answerPart = assistantMessage
 ? getAnswerPartFromAssistantMessage(assistantMessage, false)
 : undefined;
 const answerText = answerPart?.text ?? '';

 // Build the base URL and chat URL
 const baseUrl = env.AUTH_URL;

 // Convert to portable markdown (replaces @file: references with markdown links)
 const portableAnswer = convertLLMOutputToPortableMarkdown(answerText, baseUrl);
 const chatUrl = `${baseUrl}/${org.domain}/chat/${chat.id}`;

 logger.debug(`Completed blocking agent for chat ${chat.id}`, {
 chatId: chat.id,
 });

 return {
 answer: portableAnswer,
 chatId: chat.id,
 chatUrl,
 languageModel: {
 provider: languageModelConfig.provider,
 model: languageModelConfig.model,
 displayName: languageModelConfig.displayName,
 },
 } satisfies BlockingChatResponse;
 })
 );
 const response = await askCodebase(parsed.data);

 if (isServiceError(response)) {
 return serviceErrorResponse(response);
 }

 return NextResponse.json(response);
});

const blockStreamUntilFinish = async <T extends UIMessage<unknown, UIDataTypes, UITools>>(stream: ReadableStream<InferUIMessageChunk<T>>) => {
 const reader = stream.getReader();
 while (true as const) {
 const { done } = await reader.read();
 if (done) break;
 }
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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feat(web): add MCP HTTP endpoint with Streamable HTTP transport#976

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 Merged

brendan-kellam
merged 5 commits into

from

Mar 4, 2026
 Merged


feat(web): add MCP HTTP endpoint with Streamable HTTP transport
#976
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49fc1b5

feat(web): add MCP HTTP endpoint with Streamable HTTP transport (SOU-…


brendan-kellam Mar 4, 2026
f2b5d1c

add method to apiHandler


brendan-kellam Mar 4, 2026
316b685

changelog


brendan-kellam Mar 4, 2026
425b7bf

feedback


brendan-kellam Mar 4, 2026
06c1906

feedback


brendan-kellam Mar 4, 2026

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3 changes: 3 additions & 0 deletions
CHANGELOG.md

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Expand Up@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

## [Unreleased]

### Added
- Added support a MCP streamable http transport hosted at `/api/mcp`. [#976](https://github.com/sourcebot-dev/sourcebot/pull/976)

## [4.13.2] - 2026-03-02

### Changed
Expand Down

1 change: 1 addition & 0 deletions
packages/web/package.json

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Expand Up@@ -59,6 +59,7 @@
 "@hookform/resolvers": "^3.9.0",
 "@iconify/react": "^5.1.0",
 "@iizukak/codemirror-lang-wgsl": "^0.3.0",
 "@modelcontextprotocol/sdk": "^1.27.1",
 "@openrouter/ai-sdk-provider": "^2.2.3",
 "@opentelemetry/api-logs": "^0.203.0",
 "@opentelemetry/instrumentation": "^0.203.0",
Expand Down

12 changes: 8 additions & 4 deletions
packages/web/src/app/[domain]/askgh/[owner]/[repo]/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,13 +1,13 @@
import { addGithubRepo } from "@/features/workerApi/actions";
import { isServiceError, unwrapServiceError } from "@/lib/utils";
import { isServiceError } from "@/lib/utils";
import { ServiceErrorException } from "@/lib/serviceError";
import { prisma } from "@/prisma";
import { SINGLE_TENANT_ORG_ID } from "@/lib/constants";
import { getRepoInfo } from "./api";
import { CustomSlateEditor } from "@/features/chat/customSlateEditor";
import { RepoIndexedGuard } from "./components/repoIndexedGuard";
import { LandingPage } from "./components/landingPage";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { auth } from "@/auth";

interface PageProps {
Expand DownExpand Up@@ -45,8 +45,12 @@ export default async function GitHubRepoPage(props: PageProps) {
 return response.repoId;
 })();

 const repoInfo = await unwrapServiceError(getRepoInfo(repoId));
 const languageModels = await unwrapServiceError(getConfiguredLanguageModelsInfo());
 const repoInfo = await getRepoInfo(repoId)
 const languageModels = await getConfiguredLanguageModelsInfo()

 if (isServiceError(repoInfo)) {
 throw new ServiceErrorException(repoInfo);
 }
Comment thread
brendan-kellam marked this conversation as resolved.


 return (
 <RepoIndexedGuard initialRepoInfo={repoInfo}>
Expand Down

2 changes: 1 addition & 1 deletion
packages/web/src/app/[domain]/browse/layout.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
import { auth } from "@/auth";
import { LayoutClient } from "./layoutClient";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";

interface LayoutProps {
 children: React.ReactNode;
Expand Down

3 changes: 2 additions & 1 deletion
packages/web/src/app/[domain]/chat/[id]/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,5 +1,6 @@
import { getRepos, getSearchContexts } from '@/actions';
import { getUserChatHistory, getConfiguredLanguageModelsInfo, getChatInfo, claimAnonymousChats, getSharedWithUsersForChat } from '@/features/chat/actions';
import { getUserChatHistory, getChatInfo, claimAnonymousChats, getSharedWithUsersForChat } from '@/features/chat/actions';
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { ServiceErrorException } from '@/lib/serviceError';
import { isServiceError } from '@/lib/utils';
import { ChatThreadPanel } from './components/chatThreadPanel';
Expand Down

3 changes: 2 additions & 1 deletion
packages/web/src/app/[domain]/chat/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
import { getRepos, getReposStats, getSearchContexts } from "@/actions";
import { SourcebotLogo } from "@/app/components/sourcebotLogo";
import { getConfiguredLanguageModelsInfo, getUserChatHistory } from "@/features/chat/actions";
import { getUserChatHistory } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { CustomSlateEditor } from "@/features/chat/customSlateEditor";
import { ServiceErrorException } from "@/lib/serviceError";
import { isServiceError, measure } from "@/lib/utils";
Expand Down

2 changes: 1 addition & 1 deletion
packages/web/src/app/[domain]/search/page.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -2,7 +2,7 @@ import { env } from "@sourcebot/shared";
import { SearchLandingPage } from "./components/searchLandingPage";
import { SearchResultsPage } from "./components/searchResultsPage";
import { auth } from "@/auth";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";

interface SearchPageProps {
 params: Promise<{ domain: string }>;
Expand Down

229 changes: 8 additions & 221 deletions
packages/web/src/app/api/(server)/chat/blocking/route.ts

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Original file line numberDiff line numberDiff line change
@@ -1,23 +1,11 @@
import { sew } from "@/actions";
import { _getConfiguredLanguageModelsFull, _getAISDKLanguageModelAndOptions, _updateChatMessages, _generateChatNameFromMessage } from "@/features/chat/actions";
import { LanguageModelInfo, languageModelInfoSchema, SBChatMessage, SearchScope } from "@/features/chat/types";
import { convertLLMOutputToPortableMarkdown, getAnswerPartFromAssistantMessage, getLanguageModelKey } from "@/features/chat/utils";
import { ErrorCode } from "@/lib/errorCodes";
import { requestBodySchemaValidationError, ServiceError, ServiceErrorException, serviceErrorResponse } from "@/lib/serviceError";
import { askCodebase } from "@/features/mcp/askCodebase";
import { languageModelInfoSchema } from "@/features/chat/types";
import { apiHandler } from "@/lib/apiHandler";
import { requestBodySchemaValidationError, serviceErrorResponse } from "@/lib/serviceError";
import { isServiceError } from "@/lib/utils";
import { withOptionalAuthV2 } from "@/withAuthV2";
import { ChatVisibility, Prisma } from "@sourcebot/db";
import { createLogger, env } from "@sourcebot/shared";
import { randomUUID } from "crypto";
import { StatusCodes } from "http-status-codes";
import { ChatVisibility } from "@sourcebot/db";
import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { createMessageStream } from "../route";
import { InferUIMessageChunk, UITools, UIDataTypes, UIMessage } from "ai";
import { apiHandler } from "@/lib/apiHandler";
import { captureEvent } from "@/lib/posthog";

const logger = createLogger('chat-blocking-api');

/**
 * Request schema for the blocking chat API.
Expand All@@ -40,22 +28,12 @@ const blockingChatRequestSchema = z.object({
 .describe("The visibility of the chat session. If not provided, defaults to PRIVATE for authenticated users and PUBLIC for anonymous users. Set to PUBLIC to make the chat viewable by anyone with the link. Note: Anonymous users cannot create PRIVATE chats; any PRIVATE request from an unauthenticated user will be ignored and set to PUBLIC."),
});

/**
 * Response schema for the blocking chat API.
 */
interface BlockingChatResponse {
 answer: string;
 chatId: string;
 chatUrl: string;
 languageModel: LanguageModelInfo;
}

/**
 * POST /api/chat/blocking
 *
 *
 * A blocking (non-streaming) chat endpoint designed for MCP and other integrations.
 * Creates a chat session, runs the agent to completion, and returns the final answer.
 *
 *
 * The chat session is persisted to the database, allowing users to view the full
 * conversation (including tool calls and reasoning) in the web UI.
 */
Expand All@@ -67,202 +45,11 @@ export const POST = apiHandler(async (request: NextRequest) => {
 return serviceErrorResponse(requestBodySchemaValidationError(parsed.error));
 }

 const { query, repos = [], languageModel: requestedLanguageModel, visibility: requestedVisibility } = parsed.data;

 const response: BlockingChatResponse | ServiceError = await sew(() =>
 withOptionalAuthV2(async ({ org, user, prisma }) => {
 // Get all configured language models
 const configuredModels = await _getConfiguredLanguageModelsFull();
 if (configuredModels.length === 0) {
 return {
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: "No language models are configured. Please configure at least one language model. See: https://docs.sourcebot.dev/docs/configuration/language-model-providers",
 } satisfies ServiceError;
 }

 // Use the requested language model if provided, otherwise default to the first configured model
 let languageModelConfig = configuredModels[0];
 if (requestedLanguageModel) {
 const matchingModel = configuredModels.find(
 (m) => getLanguageModelKey(m) === getLanguageModelKey(requestedLanguageModel as LanguageModelInfo)
 );
 if (!matchingModel) {
 return {
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: `Language model '${requestedLanguageModel.provider}/${requestedLanguageModel.model}' is not configured.`,
 } satisfies ServiceError;
 }
 languageModelConfig = matchingModel;
 }

 const { model, providerOptions } = await _getAISDKLanguageModelAndOptions(languageModelConfig);
 const modelName = languageModelConfig.displayName ?? languageModelConfig.model;

 // Determine visibility: anonymous users cannot create private chats (they would be inaccessible)
 // Only use requested visibility if user is authenticated, otherwise always use PUBLIC
 const chatVisibility = (requestedVisibility && user)
 ? requestedVisibility
 : (user ? ChatVisibility.PRIVATE : ChatVisibility.PUBLIC);

 // Create a new chat session
 const chat = await prisma.chat.create({
 data: {
 orgId: org.id,
 createdById: user?.id,
 visibility: chatVisibility,
 messages: [] as unknown as Prisma.InputJsonValue,
 },
 });

 await captureEvent('wa_chat_thread_created', {
 chatId: chat.id,
 isAnonymous: !user,
 });

 // Run the agent to completion
 logger.debug(`Starting blocking agent for chat ${chat.id}`, {
 chatId: chat.id,
 query: query.substring(0, 100),
 model: modelName,
 });

 // Create the initial user message
 const userMessage: SBChatMessage = {
 id: randomUUID(),
 role: 'user',
 parts: [{ type: 'text', text: query }],
 };

 const selectedRepos = (await Promise.all(repos.map(async (repo) => {
 const repoDB = await prisma.repo.findFirst({
 where: {
 name: repo,
 },
 });

 if (!repoDB) {
 throw new ServiceErrorException({
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: `Repository '${repo}' not found.`,
 })
 }

 return {
 type: 'repo',
 value: repoDB.name,
 name: repoDB.displayName ?? repoDB.name.split('/').pop() ?? repoDB.name,
 codeHostType: repoDB.external_codeHostType,
 } satisfies SearchScope;
 })));

 // We'll capture the final messages and usage from the stream
 let finalMessages: SBChatMessage[] = [];

 await captureEvent('wa_chat_message_sent', {
 chatId: chat.id,
 messageCount: 1,
 selectedReposCount: selectedRepos.length,
 ...(env.EXPERIMENT_ASK_GH_ENABLED === 'true' ? {
 selectedRepos: selectedRepos.map(r => r.value)
 } : {}),
 });

 const stream = await createMessageStream({
 chatId: chat.id,
 messages: [userMessage],
 metadata: {
 selectedSearchScopes: selectedRepos,
 },
 selectedRepos: selectedRepos.map(r => r.value),
 model,
 modelName,
 modelProviderOptions: providerOptions,
 onFinish: async ({ messages }) => {
 finalMessages = messages;
 },
 onError: (error) => {
 if (error instanceof ServiceErrorException) {
 throw error;
 }

 const message = error instanceof Error ? error.message : String(error);
 throw new ServiceErrorException({
 statusCode: StatusCodes.INTERNAL_SERVER_ERROR,
 errorCode: ErrorCode.UNEXPECTED_ERROR,
 message,
 });
 },
 })

 const [_, name] = await Promise.all([
 // Consume the stream fully to trigger onFinish
 blockStreamUntilFinish(stream),
 // Generate and update the chat name
 _generateChatNameFromMessage({
 message: query,
 languageModelConfig,
 })
 ]);

 // Persist the messages to the chat
 await _updateChatMessages({ chatId: chat.id, messages: finalMessages, prisma });

 // Update the chat name
 await prisma.chat.update({
 where: {
 id: chat.id,
 orgId: org.id,
 },
 data: {
 name: name,
 },
 });

 // Extract the answer text from the assistant message
 const assistantMessage = finalMessages.find(m => m.role === 'assistant');
 const answerPart = assistantMessage
 ? getAnswerPartFromAssistantMessage(assistantMessage, false)
 : undefined;
 const answerText = answerPart?.text ?? '';

 // Build the base URL and chat URL
 const baseUrl = env.AUTH_URL;

 // Convert to portable markdown (replaces @file: references with markdown links)
 const portableAnswer = convertLLMOutputToPortableMarkdown(answerText, baseUrl);
 const chatUrl = `${baseUrl}/${org.domain}/chat/${chat.id}`;

 logger.debug(`Completed blocking agent for chat ${chat.id}`, {
 chatId: chat.id,
 });

 return {
 answer: portableAnswer,
 chatId: chat.id,
 chatUrl,
 languageModel: {
 provider: languageModelConfig.provider,
 model: languageModelConfig.model,
 displayName: languageModelConfig.displayName,
 },
 } satisfies BlockingChatResponse;
 })
 );
 const response = await askCodebase(parsed.data);

 if (isServiceError(response)) {
 return serviceErrorResponse(response);
 }

 return NextResponse.json(response);
});

const blockStreamUntilFinish = async <T extends UIMessage<unknown, UIDataTypes, UITools>>(stream: ReadableStream<InferUIMessageChunk<T>>) => {
 const reader = stream.getReader();
 while (true as const) {
 const { done } = await reader.read();
 if (done) break;
 }
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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feat(web): add MCP HTTP endpoint with Streamable HTTP transport#976

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brendan-kellam
merged 5 commits into

from

Mar 4, 2026
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feat(web): add MCP HTTP endpoint with Streamable HTTP transport
#976
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49fc1b5

feat(web): add MCP HTTP endpoint with Streamable HTTP transport (SOU-…


brendan-kellam Mar 4, 2026
f2b5d1c

add method to apiHandler


brendan-kellam Mar 4, 2026
316b685

changelog


brendan-kellam Mar 4, 2026
425b7bf

feedback


brendan-kellam Mar 4, 2026
06c1906

feedback


brendan-kellam Mar 4, 2026

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3 changes: 3 additions & 0 deletions
CHANGELOG.md

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Original file line numberDiff line numberDiff line change
Expand Up@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

## [Unreleased]

### Added
- Added support a MCP streamable http transport hosted at `/api/mcp`. [#976](https://github.com/sourcebot-dev/sourcebot/pull/976)

## [4.13.2] - 2026-03-02

### Changed
Expand Down

1 change: 1 addition & 0 deletions
packages/web/package.json

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Original file line numberDiff line numberDiff line change
Expand Up@@ -59,6 +59,7 @@
 "@hookform/resolvers": "^3.9.0",
 "@iconify/react": "^5.1.0",
 "@iizukak/codemirror-lang-wgsl": "^0.3.0",
 "@modelcontextprotocol/sdk": "^1.27.1",
 "@openrouter/ai-sdk-provider": "^2.2.3",
 "@opentelemetry/api-logs": "^0.203.0",
 "@opentelemetry/instrumentation": "^0.203.0",
Expand Down

12 changes: 8 additions & 4 deletions
packages/web/src/app/[domain]/askgh/[owner]/[repo]/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,13 +1,13 @@
import { addGithubRepo } from "@/features/workerApi/actions";
import { isServiceError, unwrapServiceError } from "@/lib/utils";
import { isServiceError } from "@/lib/utils";
import { ServiceErrorException } from "@/lib/serviceError";
import { prisma } from "@/prisma";
import { SINGLE_TENANT_ORG_ID } from "@/lib/constants";
import { getRepoInfo } from "./api";
import { CustomSlateEditor } from "@/features/chat/customSlateEditor";
import { RepoIndexedGuard } from "./components/repoIndexedGuard";
import { LandingPage } from "./components/landingPage";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { auth } from "@/auth";

interface PageProps {
Expand DownExpand Up@@ -45,8 +45,12 @@ export default async function GitHubRepoPage(props: PageProps) {
 return response.repoId;
 })();

 const repoInfo = await unwrapServiceError(getRepoInfo(repoId));
 const languageModels = await unwrapServiceError(getConfiguredLanguageModelsInfo());
 const repoInfo = await getRepoInfo(repoId)
 const languageModels = await getConfiguredLanguageModelsInfo()

 if (isServiceError(repoInfo)) {
 throw new ServiceErrorException(repoInfo);
 }
Comment thread
brendan-kellam marked this conversation as resolved.


 return (
 <RepoIndexedGuard initialRepoInfo={repoInfo}>
Expand Down

2 changes: 1 addition & 1 deletion
packages/web/src/app/[domain]/browse/layout.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
import { auth } from "@/auth";
import { LayoutClient } from "./layoutClient";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";

interface LayoutProps {
 children: React.ReactNode;
Expand Down

3 changes: 2 additions & 1 deletion
packages/web/src/app/[domain]/chat/[id]/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,5 +1,6 @@
import { getRepos, getSearchContexts } from '@/actions';
import { getUserChatHistory, getConfiguredLanguageModelsInfo, getChatInfo, claimAnonymousChats, getSharedWithUsersForChat } from '@/features/chat/actions';
import { getUserChatHistory, getChatInfo, claimAnonymousChats, getSharedWithUsersForChat } from '@/features/chat/actions';
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { ServiceErrorException } from '@/lib/serviceError';
import { isServiceError } from '@/lib/utils';
import { ChatThreadPanel } from './components/chatThreadPanel';
Expand Down

3 changes: 2 additions & 1 deletion
packages/web/src/app/[domain]/chat/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
import { getRepos, getReposStats, getSearchContexts } from "@/actions";
import { SourcebotLogo } from "@/app/components/sourcebotLogo";
import { getConfiguredLanguageModelsInfo, getUserChatHistory } from "@/features/chat/actions";
import { getUserChatHistory } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { CustomSlateEditor } from "@/features/chat/customSlateEditor";
import { ServiceErrorException } from "@/lib/serviceError";
import { isServiceError, measure } from "@/lib/utils";
Expand Down

2 changes: 1 addition & 1 deletion
packages/web/src/app/[domain]/search/page.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -2,7 +2,7 @@ import { env } from "@sourcebot/shared";
import { SearchLandingPage } from "./components/searchLandingPage";
import { SearchResultsPage } from "./components/searchResultsPage";
import { auth } from "@/auth";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";

interface SearchPageProps {
 params: Promise<{ domain: string }>;
Expand Down

229 changes: 8 additions & 221 deletions
packages/web/src/app/api/(server)/chat/blocking/route.ts

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Original file line numberDiff line numberDiff line change
@@ -1,23 +1,11 @@
import { sew } from "@/actions";
import { _getConfiguredLanguageModelsFull, _getAISDKLanguageModelAndOptions, _updateChatMessages, _generateChatNameFromMessage } from "@/features/chat/actions";
import { LanguageModelInfo, languageModelInfoSchema, SBChatMessage, SearchScope } from "@/features/chat/types";
import { convertLLMOutputToPortableMarkdown, getAnswerPartFromAssistantMessage, getLanguageModelKey } from "@/features/chat/utils";
import { ErrorCode } from "@/lib/errorCodes";
import { requestBodySchemaValidationError, ServiceError, ServiceErrorException, serviceErrorResponse } from "@/lib/serviceError";
import { askCodebase } from "@/features/mcp/askCodebase";
import { languageModelInfoSchema } from "@/features/chat/types";
import { apiHandler } from "@/lib/apiHandler";
import { requestBodySchemaValidationError, serviceErrorResponse } from "@/lib/serviceError";
import { isServiceError } from "@/lib/utils";
import { withOptionalAuthV2 } from "@/withAuthV2";
import { ChatVisibility, Prisma } from "@sourcebot/db";
import { createLogger, env } from "@sourcebot/shared";
import { randomUUID } from "crypto";
import { StatusCodes } from "http-status-codes";
import { ChatVisibility } from "@sourcebot/db";
import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { createMessageStream } from "../route";
import { InferUIMessageChunk, UITools, UIDataTypes, UIMessage } from "ai";
import { apiHandler } from "@/lib/apiHandler";
import { captureEvent } from "@/lib/posthog";

const logger = createLogger('chat-blocking-api');

/**
 * Request schema for the blocking chat API.
Expand All@@ -40,22 +28,12 @@ const blockingChatRequestSchema = z.object({
 .describe("The visibility of the chat session. If not provided, defaults to PRIVATE for authenticated users and PUBLIC for anonymous users. Set to PUBLIC to make the chat viewable by anyone with the link. Note: Anonymous users cannot create PRIVATE chats; any PRIVATE request from an unauthenticated user will be ignored and set to PUBLIC."),
});

/**
 * Response schema for the blocking chat API.
 */
interface BlockingChatResponse {
 answer: string;
 chatId: string;
 chatUrl: string;
 languageModel: LanguageModelInfo;
}

/**
 * POST /api/chat/blocking
 *
 *
 * A blocking (non-streaming) chat endpoint designed for MCP and other integrations.
 * Creates a chat session, runs the agent to completion, and returns the final answer.
 *
 *
 * The chat session is persisted to the database, allowing users to view the full
 * conversation (including tool calls and reasoning) in the web UI.
 */
Expand All@@ -67,202 +45,11 @@ export const POST = apiHandler(async (request: NextRequest) => {
 return serviceErrorResponse(requestBodySchemaValidationError(parsed.error));
 }

 const { query, repos = [], languageModel: requestedLanguageModel, visibility: requestedVisibility } = parsed.data;

 const response: BlockingChatResponse | ServiceError = await sew(() =>
 withOptionalAuthV2(async ({ org, user, prisma }) => {
 // Get all configured language models
 const configuredModels = await _getConfiguredLanguageModelsFull();
 if (configuredModels.length === 0) {
 return {
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: "No language models are configured. Please configure at least one language model. See: https://docs.sourcebot.dev/docs/configuration/language-model-providers",
 } satisfies ServiceError;
 }

 // Use the requested language model if provided, otherwise default to the first configured model
 let languageModelConfig = configuredModels[0];
 if (requestedLanguageModel) {
 const matchingModel = configuredModels.find(
 (m) => getLanguageModelKey(m) === getLanguageModelKey(requestedLanguageModel as LanguageModelInfo)
 );
 if (!matchingModel) {
 return {
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: `Language model '${requestedLanguageModel.provider}/${requestedLanguageModel.model}' is not configured.`,
 } satisfies ServiceError;
 }
 languageModelConfig = matchingModel;
 }

 const { model, providerOptions } = await _getAISDKLanguageModelAndOptions(languageModelConfig);
 const modelName = languageModelConfig.displayName ?? languageModelConfig.model;

 // Determine visibility: anonymous users cannot create private chats (they would be inaccessible)
 // Only use requested visibility if user is authenticated, otherwise always use PUBLIC
 const chatVisibility = (requestedVisibility && user)
 ? requestedVisibility
 : (user ? ChatVisibility.PRIVATE : ChatVisibility.PUBLIC);

 // Create a new chat session
 const chat = await prisma.chat.create({
 data: {
 orgId: org.id,
 createdById: user?.id,
 visibility: chatVisibility,
 messages: [] as unknown as Prisma.InputJsonValue,
 },
 });

 await captureEvent('wa_chat_thread_created', {
 chatId: chat.id,
 isAnonymous: !user,
 });

 // Run the agent to completion
 logger.debug(`Starting blocking agent for chat ${chat.id}`, {
 chatId: chat.id,
 query: query.substring(0, 100),
 model: modelName,
 });

 // Create the initial user message
 const userMessage: SBChatMessage = {
 id: randomUUID(),
 role: 'user',
 parts: [{ type: 'text', text: query }],
 };

 const selectedRepos = (await Promise.all(repos.map(async (repo) => {
 const repoDB = await prisma.repo.findFirst({
 where: {
 name: repo,
 },
 });

 if (!repoDB) {
 throw new ServiceErrorException({
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: `Repository '${repo}' not found.`,
 })
 }

 return {
 type: 'repo',
 value: repoDB.name,
 name: repoDB.displayName ?? repoDB.name.split('/').pop() ?? repoDB.name,
 codeHostType: repoDB.external_codeHostType,
 } satisfies SearchScope;
 })));

 // We'll capture the final messages and usage from the stream
 let finalMessages: SBChatMessage[] = [];

 await captureEvent('wa_chat_message_sent', {
 chatId: chat.id,
 messageCount: 1,
 selectedReposCount: selectedRepos.length,
 ...(env.EXPERIMENT_ASK_GH_ENABLED === 'true' ? {
 selectedRepos: selectedRepos.map(r => r.value)
 } : {}),
 });

 const stream = await createMessageStream({
 chatId: chat.id,
 messages: [userMessage],
 metadata: {
 selectedSearchScopes: selectedRepos,
 },
 selectedRepos: selectedRepos.map(r => r.value),
 model,
 modelName,
 modelProviderOptions: providerOptions,
 onFinish: async ({ messages }) => {
 finalMessages = messages;
 },
 onError: (error) => {
 if (error instanceof ServiceErrorException) {
 throw error;
 }

 const message = error instanceof Error ? error.message : String(error);
 throw new ServiceErrorException({
 statusCode: StatusCodes.INTERNAL_SERVER_ERROR,
 errorCode: ErrorCode.UNEXPECTED_ERROR,
 message,
 });
 },
 })

 const [_, name] = await Promise.all([
 // Consume the stream fully to trigger onFinish
 blockStreamUntilFinish(stream),
 // Generate and update the chat name
 _generateChatNameFromMessage({
 message: query,
 languageModelConfig,
 })
 ]);

 // Persist the messages to the chat
 await _updateChatMessages({ chatId: chat.id, messages: finalMessages, prisma });

 // Update the chat name
 await prisma.chat.update({
 where: {
 id: chat.id,
 orgId: org.id,
 },
 data: {
 name: name,
 },
 });

 // Extract the answer text from the assistant message
 const assistantMessage = finalMessages.find(m => m.role === 'assistant');
 const answerPart = assistantMessage
 ? getAnswerPartFromAssistantMessage(assistantMessage, false)
 : undefined;
 const answerText = answerPart?.text ?? '';

 // Build the base URL and chat URL
 const baseUrl = env.AUTH_URL;

 // Convert to portable markdown (replaces @file: references with markdown links)
 const portableAnswer = convertLLMOutputToPortableMarkdown(answerText, baseUrl);
 const chatUrl = `${baseUrl}/${org.domain}/chat/${chat.id}`;

 logger.debug(`Completed blocking agent for chat ${chat.id}`, {
 chatId: chat.id,
 });

 return {
 answer: portableAnswer,
 chatId: chat.id,
 chatUrl,
 languageModel: {
 provider: languageModelConfig.provider,
 model: languageModelConfig.model,
 displayName: languageModelConfig.displayName,
 },
 } satisfies BlockingChatResponse;
 })
 );
 const response = await askCodebase(parsed.data);

 if (isServiceError(response)) {
 return serviceErrorResponse(response);
 }

 return NextResponse.json(response);
});

const blockStreamUntilFinish = async <T extends UIMessage<unknown, UIDataTypes, UITools>>(stream: ReadableStream<InferUIMessageChunk<T>>) => {
 const reader = stream.getReader();
 while (true as const) {
 const { done } = await reader.read();
 if (done) break;
 }
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
feat(web): add MCP HTTP endpoint with Streamable HTTP transport#976

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 Merged

brendan-kellam
merged 5 commits into

from

Mar 4, 2026
 Merged


feat(web): add MCP HTTP endpoint with Streamable HTTP transport
#976
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49fc1b5

feat(web): add MCP HTTP endpoint with Streamable HTTP transport (SOU-…


brendan-kellam Mar 4, 2026
f2b5d1c

add method to apiHandler


brendan-kellam Mar 4, 2026
316b685

changelog


brendan-kellam Mar 4, 2026
425b7bf

feedback


brendan-kellam Mar 4, 2026
06c1906

feedback


brendan-kellam Mar 4, 2026

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3 changes: 3 additions & 0 deletions
CHANGELOG.md

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Original file line numberDiff line numberDiff line change
Expand Up@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

## [Unreleased]

### Added
- Added support a MCP streamable http transport hosted at `/api/mcp`. [#976](https://github.com/sourcebot-dev/sourcebot/pull/976)

## [4.13.2] - 2026-03-02

### Changed
Expand Down

1 change: 1 addition & 0 deletions
packages/web/package.json

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Original file line numberDiff line numberDiff line change
Expand Up@@ -59,6 +59,7 @@
 "@hookform/resolvers": "^3.9.0",
 "@iconify/react": "^5.1.0",
 "@iizukak/codemirror-lang-wgsl": "^0.3.0",
 "@modelcontextprotocol/sdk": "^1.27.1",
 "@openrouter/ai-sdk-provider": "^2.2.3",
 "@opentelemetry/api-logs": "^0.203.0",
 "@opentelemetry/instrumentation": "^0.203.0",
Expand Down

12 changes: 8 additions & 4 deletions
packages/web/src/app/[domain]/askgh/[owner]/[repo]/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,13 +1,13 @@
import { addGithubRepo } from "@/features/workerApi/actions";
import { isServiceError, unwrapServiceError } from "@/lib/utils";
import { isServiceError } from "@/lib/utils";
import { ServiceErrorException } from "@/lib/serviceError";
import { prisma } from "@/prisma";
import { SINGLE_TENANT_ORG_ID } from "@/lib/constants";
import { getRepoInfo } from "./api";
import { CustomSlateEditor } from "@/features/chat/customSlateEditor";
import { RepoIndexedGuard } from "./components/repoIndexedGuard";
import { LandingPage } from "./components/landingPage";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { auth } from "@/auth";

interface PageProps {
Expand DownExpand Up@@ -45,8 +45,12 @@ export default async function GitHubRepoPage(props: PageProps) {
 return response.repoId;
 })();

 const repoInfo = await unwrapServiceError(getRepoInfo(repoId));
 const languageModels = await unwrapServiceError(getConfiguredLanguageModelsInfo());
 const repoInfo = await getRepoInfo(repoId)
 const languageModels = await getConfiguredLanguageModelsInfo()

 if (isServiceError(repoInfo)) {
 throw new ServiceErrorException(repoInfo);
 }
Comment thread
brendan-kellam marked this conversation as resolved.


 return (
 <RepoIndexedGuard initialRepoInfo={repoInfo}>
Expand Down

2 changes: 1 addition & 1 deletion
packages/web/src/app/[domain]/browse/layout.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
import { auth } from "@/auth";
import { LayoutClient } from "./layoutClient";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";

interface LayoutProps {
 children: React.ReactNode;
Expand Down

3 changes: 2 additions & 1 deletion
packages/web/src/app/[domain]/chat/[id]/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,5 +1,6 @@
import { getRepos, getSearchContexts } from '@/actions';
import { getUserChatHistory, getConfiguredLanguageModelsInfo, getChatInfo, claimAnonymousChats, getSharedWithUsersForChat } from '@/features/chat/actions';
import { getUserChatHistory, getChatInfo, claimAnonymousChats, getSharedWithUsersForChat } from '@/features/chat/actions';
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { ServiceErrorException } from '@/lib/serviceError';
import { isServiceError } from '@/lib/utils';
import { ChatThreadPanel } from './components/chatThreadPanel';
Expand Down

3 changes: 2 additions & 1 deletion
packages/web/src/app/[domain]/chat/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
import { getRepos, getReposStats, getSearchContexts } from "@/actions";
import { SourcebotLogo } from "@/app/components/sourcebotLogo";
import { getConfiguredLanguageModelsInfo, getUserChatHistory } from "@/features/chat/actions";
import { getUserChatHistory } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { CustomSlateEditor } from "@/features/chat/customSlateEditor";
import { ServiceErrorException } from "@/lib/serviceError";
import { isServiceError, measure } from "@/lib/utils";
Expand Down

2 changes: 1 addition & 1 deletion
packages/web/src/app/[domain]/search/page.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -2,7 +2,7 @@ import { env } from "@sourcebot/shared";
import { SearchLandingPage } from "./components/searchLandingPage";
import { SearchResultsPage } from "./components/searchResultsPage";
import { auth } from "@/auth";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";

interface SearchPageProps {
 params: Promise<{ domain: string }>;
Expand Down

229 changes: 8 additions & 221 deletions
packages/web/src/app/api/(server)/chat/blocking/route.ts

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@@ -1,23 +1,11 @@
import { sew } from "@/actions";
import { _getConfiguredLanguageModelsFull, _getAISDKLanguageModelAndOptions, _updateChatMessages, _generateChatNameFromMessage } from "@/features/chat/actions";
import { LanguageModelInfo, languageModelInfoSchema, SBChatMessage, SearchScope } from "@/features/chat/types";
import { convertLLMOutputToPortableMarkdown, getAnswerPartFromAssistantMessage, getLanguageModelKey } from "@/features/chat/utils";
import { ErrorCode } from "@/lib/errorCodes";
import { requestBodySchemaValidationError, ServiceError, ServiceErrorException, serviceErrorResponse } from "@/lib/serviceError";
import { askCodebase } from "@/features/mcp/askCodebase";
import { languageModelInfoSchema } from "@/features/chat/types";
import { apiHandler } from "@/lib/apiHandler";
import { requestBodySchemaValidationError, serviceErrorResponse } from "@/lib/serviceError";
import { isServiceError } from "@/lib/utils";
import { withOptionalAuthV2 } from "@/withAuthV2";
import { ChatVisibility, Prisma } from "@sourcebot/db";
import { createLogger, env } from "@sourcebot/shared";
import { randomUUID } from "crypto";
import { StatusCodes } from "http-status-codes";
import { ChatVisibility } from "@sourcebot/db";
import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { createMessageStream } from "../route";
import { InferUIMessageChunk, UITools, UIDataTypes, UIMessage } from "ai";
import { apiHandler } from "@/lib/apiHandler";
import { captureEvent } from "@/lib/posthog";

const logger = createLogger('chat-blocking-api');

/**
 * Request schema for the blocking chat API.
Expand All@@ -40,22 +28,12 @@ const blockingChatRequestSchema = z.object({
 .describe("The visibility of the chat session. If not provided, defaults to PRIVATE for authenticated users and PUBLIC for anonymous users. Set to PUBLIC to make the chat viewable by anyone with the link. Note: Anonymous users cannot create PRIVATE chats; any PRIVATE request from an unauthenticated user will be ignored and set to PUBLIC."),
});

/**
 * Response schema for the blocking chat API.
 */
interface BlockingChatResponse {
 answer: string;
 chatId: string;
 chatUrl: string;
 languageModel: LanguageModelInfo;
}

/**
 * POST /api/chat/blocking
 *
 *
 * A blocking (non-streaming) chat endpoint designed for MCP and other integrations.
 * Creates a chat session, runs the agent to completion, and returns the final answer.
 *
 *
 * The chat session is persisted to the database, allowing users to view the full
 * conversation (including tool calls and reasoning) in the web UI.
 */
Expand All@@ -67,202 +45,11 @@ export const POST = apiHandler(async (request: NextRequest) => {
 return serviceErrorResponse(requestBodySchemaValidationError(parsed.error));
 }

 const { query, repos = [], languageModel: requestedLanguageModel, visibility: requestedVisibility } = parsed.data;

 const response: BlockingChatResponse | ServiceError = await sew(() =>
 withOptionalAuthV2(async ({ org, user, prisma }) => {
 // Get all configured language models
 const configuredModels = await _getConfiguredLanguageModelsFull();
 if (configuredModels.length === 0) {
 return {
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: "No language models are configured. Please configure at least one language model. See: https://docs.sourcebot.dev/docs/configuration/language-model-providers",
 } satisfies ServiceError;
 }

 // Use the requested language model if provided, otherwise default to the first configured model
 let languageModelConfig = configuredModels[0];
 if (requestedLanguageModel) {
 const matchingModel = configuredModels.find(
 (m) => getLanguageModelKey(m) === getLanguageModelKey(requestedLanguageModel as LanguageModelInfo)
 );
 if (!matchingModel) {
 return {
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: `Language model '${requestedLanguageModel.provider}/${requestedLanguageModel.model}' is not configured.`,
 } satisfies ServiceError;
 }
 languageModelConfig = matchingModel;
 }

 const { model, providerOptions } = await _getAISDKLanguageModelAndOptions(languageModelConfig);
 const modelName = languageModelConfig.displayName ?? languageModelConfig.model;

 // Determine visibility: anonymous users cannot create private chats (they would be inaccessible)
 // Only use requested visibility if user is authenticated, otherwise always use PUBLIC
 const chatVisibility = (requestedVisibility && user)
 ? requestedVisibility
 : (user ? ChatVisibility.PRIVATE : ChatVisibility.PUBLIC);

 // Create a new chat session
 const chat = await prisma.chat.create({
 data: {
 orgId: org.id,
 createdById: user?.id,
 visibility: chatVisibility,
 messages: [] as unknown as Prisma.InputJsonValue,
 },
 });

 await captureEvent('wa_chat_thread_created', {
 chatId: chat.id,
 isAnonymous: !user,
 });

 // Run the agent to completion
 logger.debug(`Starting blocking agent for chat ${chat.id}`, {
 chatId: chat.id,
 query: query.substring(0, 100),
 model: modelName,
 });

 // Create the initial user message
 const userMessage: SBChatMessage = {
 id: randomUUID(),
 role: 'user',
 parts: [{ type: 'text', text: query }],
 };

 const selectedRepos = (await Promise.all(repos.map(async (repo) => {
 const repoDB = await prisma.repo.findFirst({
 where: {
 name: repo,
 },
 });

 if (!repoDB) {
 throw new ServiceErrorException({
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: `Repository '${repo}' not found.`,
 })
 }

 return {
 type: 'repo',
 value: repoDB.name,
 name: repoDB.displayName ?? repoDB.name.split('/').pop() ?? repoDB.name,
 codeHostType: repoDB.external_codeHostType,
 } satisfies SearchScope;
 })));

 // We'll capture the final messages and usage from the stream
 let finalMessages: SBChatMessage[] = [];

 await captureEvent('wa_chat_message_sent', {
 chatId: chat.id,
 messageCount: 1,
 selectedReposCount: selectedRepos.length,
 ...(env.EXPERIMENT_ASK_GH_ENABLED === 'true' ? {
 selectedRepos: selectedRepos.map(r => r.value)
 } : {}),
 });

 const stream = await createMessageStream({
 chatId: chat.id,
 messages: [userMessage],
 metadata: {
 selectedSearchScopes: selectedRepos,
 },
 selectedRepos: selectedRepos.map(r => r.value),
 model,
 modelName,
 modelProviderOptions: providerOptions,
 onFinish: async ({ messages }) => {
 finalMessages = messages;
 },
 onError: (error) => {
 if (error instanceof ServiceErrorException) {
 throw error;
 }

 const message = error instanceof Error ? error.message : String(error);
 throw new ServiceErrorException({
 statusCode: StatusCodes.INTERNAL_SERVER_ERROR,
 errorCode: ErrorCode.UNEXPECTED_ERROR,
 message,
 });
 },
 })

 const [_, name] = await Promise.all([
 // Consume the stream fully to trigger onFinish
 blockStreamUntilFinish(stream),
 // Generate and update the chat name
 _generateChatNameFromMessage({
 message: query,
 languageModelConfig,
 })
 ]);

 // Persist the messages to the chat
 await _updateChatMessages({ chatId: chat.id, messages: finalMessages, prisma });

 // Update the chat name
 await prisma.chat.update({
 where: {
 id: chat.id,
 orgId: org.id,
 },
 data: {
 name: name,
 },
 });

 // Extract the answer text from the assistant message
 const assistantMessage = finalMessages.find(m => m.role === 'assistant');
 const answerPart = assistantMessage
 ? getAnswerPartFromAssistantMessage(assistantMessage, false)
 : undefined;
 const answerText = answerPart?.text ?? '';

 // Build the base URL and chat URL
 const baseUrl = env.AUTH_URL;

 // Convert to portable markdown (replaces @file: references with markdown links)
 const portableAnswer = convertLLMOutputToPortableMarkdown(answerText, baseUrl);
 const chatUrl = `${baseUrl}/${org.domain}/chat/${chat.id}`;

 logger.debug(`Completed blocking agent for chat ${chat.id}`, {
 chatId: chat.id,
 });

 return {
 answer: portableAnswer,
 chatId: chat.id,
 chatUrl,
 languageModel: {
 provider: languageModelConfig.provider,
 model: languageModelConfig.model,
 displayName: languageModelConfig.displayName,
 },
 } satisfies BlockingChatResponse;
 })
 );
 const response = await askCodebase(parsed.data);

 if (isServiceError(response)) {
 return serviceErrorResponse(response);
 }

 return NextResponse.json(response);
});

const blockStreamUntilFinish = async <T extends UIMessage<unknown, UIDataTypes, UITools>>(stream: ReadableStream<InferUIMessageChunk<T>>) => {
 const reader = stream.getReader();
 while (true as const) {
 const { done } = await reader.read();
 if (done) break;
 }
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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feat(web): add MCP HTTP endpoint with Streamable HTTP transport#976

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brendan-kellam
merged 5 commits into

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Mar 4, 2026
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feat(web): add MCP HTTP endpoint with Streamable HTTP transport
#976
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49fc1b5

feat(web): add MCP HTTP endpoint with Streamable HTTP transport (SOU-…


brendan-kellam Mar 4, 2026
f2b5d1c

add method to apiHandler


brendan-kellam Mar 4, 2026
316b685

changelog


brendan-kellam Mar 4, 2026
425b7bf

feedback


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3 changes: 3 additions & 0 deletions
CHANGELOG.md

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Original file line numberDiff line numberDiff line change
Expand Up@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

## [Unreleased]

### Added
- Added support a MCP streamable http transport hosted at `/api/mcp`. [#976](https://github.com/sourcebot-dev/sourcebot/pull/976)

## [4.13.2] - 2026-03-02

### Changed
Expand Down

1 change: 1 addition & 0 deletions
packages/web/package.json

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Original file line numberDiff line numberDiff line change
Expand Up@@ -59,6 +59,7 @@
 "@hookform/resolvers": "^3.9.0",
 "@iconify/react": "^5.1.0",
 "@iizukak/codemirror-lang-wgsl": "^0.3.0",
 "@modelcontextprotocol/sdk": "^1.27.1",
 "@openrouter/ai-sdk-provider": "^2.2.3",
 "@opentelemetry/api-logs": "^0.203.0",
 "@opentelemetry/instrumentation": "^0.203.0",
Expand Down

12 changes: 8 additions & 4 deletions
packages/web/src/app/[domain]/askgh/[owner]/[repo]/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,13 +1,13 @@
import { addGithubRepo } from "@/features/workerApi/actions";
import { isServiceError, unwrapServiceError } from "@/lib/utils";
import { isServiceError } from "@/lib/utils";
import { ServiceErrorException } from "@/lib/serviceError";
import { prisma } from "@/prisma";
import { SINGLE_TENANT_ORG_ID } from "@/lib/constants";
import { getRepoInfo } from "./api";
import { CustomSlateEditor } from "@/features/chat/customSlateEditor";
import { RepoIndexedGuard } from "./components/repoIndexedGuard";
import { LandingPage } from "./components/landingPage";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { auth } from "@/auth";

interface PageProps {
Expand DownExpand Up@@ -45,8 +45,12 @@ export default async function GitHubRepoPage(props: PageProps) {
 return response.repoId;
 })();

 const repoInfo = await unwrapServiceError(getRepoInfo(repoId));
 const languageModels = await unwrapServiceError(getConfiguredLanguageModelsInfo());
 const repoInfo = await getRepoInfo(repoId)
 const languageModels = await getConfiguredLanguageModelsInfo()

 if (isServiceError(repoInfo)) {
 throw new ServiceErrorException(repoInfo);
 }
Comment thread
brendan-kellam marked this conversation as resolved.


 return (
 <RepoIndexedGuard initialRepoInfo={repoInfo}>
Expand Down

2 changes: 1 addition & 1 deletion
packages/web/src/app/[domain]/browse/layout.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
import { auth } from "@/auth";
import { LayoutClient } from "./layoutClient";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";

interface LayoutProps {
 children: React.ReactNode;
Expand Down

3 changes: 2 additions & 1 deletion
packages/web/src/app/[domain]/chat/[id]/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,5 +1,6 @@
import { getRepos, getSearchContexts } from '@/actions';
import { getUserChatHistory, getConfiguredLanguageModelsInfo, getChatInfo, claimAnonymousChats, getSharedWithUsersForChat } from '@/features/chat/actions';
import { getUserChatHistory, getChatInfo, claimAnonymousChats, getSharedWithUsersForChat } from '@/features/chat/actions';
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { ServiceErrorException } from '@/lib/serviceError';
import { isServiceError } from '@/lib/utils';
import { ChatThreadPanel } from './components/chatThreadPanel';
Expand Down

3 changes: 2 additions & 1 deletion
packages/web/src/app/[domain]/chat/page.tsx

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Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
import { getRepos, getReposStats, getSearchContexts } from "@/actions";
import { SourcebotLogo } from "@/app/components/sourcebotLogo";
import { getConfiguredLanguageModelsInfo, getUserChatHistory } from "@/features/chat/actions";
import { getUserChatHistory } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
import { CustomSlateEditor } from "@/features/chat/customSlateEditor";
import { ServiceErrorException } from "@/lib/serviceError";
import { isServiceError, measure } from "@/lib/utils";
Expand Down

2 changes: 1 addition & 1 deletion
packages/web/src/app/[domain]/search/page.tsx

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Original file line numberDiff line numberDiff line change
Expand Up@@ -2,7 +2,7 @@ import { env } from "@sourcebot/shared";
import { SearchLandingPage } from "./components/searchLandingPage";
import { SearchResultsPage } from "./components/searchResultsPage";
import { auth } from "@/auth";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/actions";
import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";

interface SearchPageProps {
 params: Promise<{ domain: string }>;
Expand Down

229 changes: 8 additions & 221 deletions
packages/web/src/app/api/(server)/chat/blocking/route.ts

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Original file line numberDiff line numberDiff line change
@@ -1,23 +1,11 @@
import { sew } from "@/actions";
import { _getConfiguredLanguageModelsFull, _getAISDKLanguageModelAndOptions, _updateChatMessages, _generateChatNameFromMessage } from "@/features/chat/actions";
import { LanguageModelInfo, languageModelInfoSchema, SBChatMessage, SearchScope } from "@/features/chat/types";
import { convertLLMOutputToPortableMarkdown, getAnswerPartFromAssistantMessage, getLanguageModelKey } from "@/features/chat/utils";
import { ErrorCode } from "@/lib/errorCodes";
import { requestBodySchemaValidationError, ServiceError, ServiceErrorException, serviceErrorResponse } from "@/lib/serviceError";
import { askCodebase } from "@/features/mcp/askCodebase";
import { languageModelInfoSchema } from "@/features/chat/types";
import { apiHandler } from "@/lib/apiHandler";
import { requestBodySchemaValidationError, serviceErrorResponse } from "@/lib/serviceError";
import { isServiceError } from "@/lib/utils";
import { withOptionalAuthV2 } from "@/withAuthV2";
import { ChatVisibility, Prisma } from "@sourcebot/db";
import { createLogger, env } from "@sourcebot/shared";
import { randomUUID } from "crypto";
import { StatusCodes } from "http-status-codes";
import { ChatVisibility } from "@sourcebot/db";
import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { createMessageStream } from "../route";
import { InferUIMessageChunk, UITools, UIDataTypes, UIMessage } from "ai";
import { apiHandler } from "@/lib/apiHandler";
import { captureEvent } from "@/lib/posthog";

const logger = createLogger('chat-blocking-api');

/**
 * Request schema for the blocking chat API.
Expand All@@ -40,22 +28,12 @@ const blockingChatRequestSchema = z.object({
 .describe("The visibility of the chat session. If not provided, defaults to PRIVATE for authenticated users and PUBLIC for anonymous users. Set to PUBLIC to make the chat viewable by anyone with the link. Note: Anonymous users cannot create PRIVATE chats; any PRIVATE request from an unauthenticated user will be ignored and set to PUBLIC."),
});

/**
 * Response schema for the blocking chat API.
 */
interface BlockingChatResponse {
 answer: string;
 chatId: string;
 chatUrl: string;
 languageModel: LanguageModelInfo;
}

/**
 * POST /api/chat/blocking
 *
 *
 * A blocking (non-streaming) chat endpoint designed for MCP and other integrations.
 * Creates a chat session, runs the agent to completion, and returns the final answer.
 *
 *
 * The chat session is persisted to the database, allowing users to view the full
 * conversation (including tool calls and reasoning) in the web UI.
 */
Expand All@@ -67,202 +45,11 @@ export const POST = apiHandler(async (request: NextRequest) => {
 return serviceErrorResponse(requestBodySchemaValidationError(parsed.error));
 }

 const { query, repos = [], languageModel: requestedLanguageModel, visibility: requestedVisibility } = parsed.data;

 const response: BlockingChatResponse | ServiceError = await sew(() =>
 withOptionalAuthV2(async ({ org, user, prisma }) => {
 // Get all configured language models
 const configuredModels = await _getConfiguredLanguageModelsFull();
 if (configuredModels.length === 0) {
 return {
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: "No language models are configured. Please configure at least one language model. See: https://docs.sourcebot.dev/docs/configuration/language-model-providers",
 } satisfies ServiceError;
 }

 // Use the requested language model if provided, otherwise default to the first configured model
 let languageModelConfig = configuredModels[0];
 if (requestedLanguageModel) {
 const matchingModel = configuredModels.find(
 (m) => getLanguageModelKey(m) === getLanguageModelKey(requestedLanguageModel as LanguageModelInfo)
 );
 if (!matchingModel) {
 return {
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: `Language model '${requestedLanguageModel.provider}/${requestedLanguageModel.model}' is not configured.`,
 } satisfies ServiceError;
 }
 languageModelConfig = matchingModel;
 }

 const { model, providerOptions } = await _getAISDKLanguageModelAndOptions(languageModelConfig);
 const modelName = languageModelConfig.displayName ?? languageModelConfig.model;

 // Determine visibility: anonymous users cannot create private chats (they would be inaccessible)
 // Only use requested visibility if user is authenticated, otherwise always use PUBLIC
 const chatVisibility = (requestedVisibility && user)
 ? requestedVisibility
 : (user ? ChatVisibility.PRIVATE : ChatVisibility.PUBLIC);

 // Create a new chat session
 const chat = await prisma.chat.create({
 data: {
 orgId: org.id,
 createdById: user?.id,
 visibility: chatVisibility,
 messages: [] as unknown as Prisma.InputJsonValue,
 },
 });

 await captureEvent('wa_chat_thread_created', {
 chatId: chat.id,
 isAnonymous: !user,
 });

 // Run the agent to completion
 logger.debug(`Starting blocking agent for chat ${chat.id}`, {
 chatId: chat.id,
 query: query.substring(0, 100),
 model: modelName,
 });

 // Create the initial user message
 const userMessage: SBChatMessage = {
 id: randomUUID(),
 role: 'user',
 parts: [{ type: 'text', text: query }],
 };

 const selectedRepos = (await Promise.all(repos.map(async (repo) => {
 const repoDB = await prisma.repo.findFirst({
 where: {
 name: repo,
 },
 });

 if (!repoDB) {
 throw new ServiceErrorException({
 statusCode: StatusCodes.BAD_REQUEST,
 errorCode: ErrorCode.INVALID_REQUEST_BODY,
 message: `Repository '${repo}' not found.`,
 })
 }

 return {
 type: 'repo',
 value: repoDB.name,
 name: repoDB.displayName ?? repoDB.name.split('/').pop() ?? repoDB.name,
 codeHostType: repoDB.external_codeHostType,
 } satisfies SearchScope;
 })));

 // We'll capture the final messages and usage from the stream
 let finalMessages: SBChatMessage[] = [];

 await captureEvent('wa_chat_message_sent', {
 chatId: chat.id,
 messageCount: 1,
 selectedReposCount: selectedRepos.length,
 ...(env.EXPERIMENT_ASK_GH_ENABLED === 'true' ? {
 selectedRepos: selectedRepos.map(r => r.value)
 } : {}),
 });

 const stream = await createMessageStream({
 chatId: chat.id,
 messages: [userMessage],
 metadata: {
 selectedSearchScopes: selectedRepos,
 },
 selectedRepos: selectedRepos.map(r => r.value),
 model,
 modelName,
 modelProviderOptions: providerOptions,
 onFinish: async ({ messages }) => {
 finalMessages = messages;
 },
 onError: (error) => {
 if (error instanceof ServiceErrorException) {
 throw error;
 }

 const message = error instanceof Error ? error.message : String(error);
 throw new ServiceErrorException({
 statusCode: StatusCodes.INTERNAL_SERVER_ERROR,
 errorCode: ErrorCode.UNEXPECTED_ERROR,
 message,
 });
 },
 })

 const [_, name] = await Promise.all([
 // Consume the stream fully to trigger onFinish
 blockStreamUntilFinish(stream),
 // Generate and update the chat name
 _generateChatNameFromMessage({
 message: query,
 languageModelConfig,
 })
 ]);

 // Persist the messages to the chat
 await _updateChatMessages({ chatId: chat.id, messages: finalMessages, prisma });

 // Update the chat name
 await prisma.chat.update({
 where: {
 id: chat.id,
 orgId: org.id,
 },
 data: {
 name: name,
 },
 });

 // Extract the answer text from the assistant message
 const assistantMessage = finalMessages.find(m => m.role === 'assistant');
 const answerPart = assistantMessage
 ? getAnswerPartFromAssistantMessage(assistantMessage, false)
 : undefined;
 const answerText = answerPart?.text ?? '';

 // Build the base URL and chat URL
 const baseUrl = env.AUTH_URL;

 // Convert to portable markdown (replaces @file: references with markdown links)
 const portableAnswer = convertLLMOutputToPortableMarkdown(answerText, baseUrl);
 const chatUrl = `${baseUrl}/${org.domain}/chat/${chat.id}`;

 logger.debug(`Completed blocking agent for chat ${chat.id}`, {
 chatId: chat.id,
 });

 return {
 answer: portableAnswer,
 chatId: chat.id,
 chatUrl,
 languageModel: {
 provider: languageModelConfig.provider,
 model: languageModelConfig.model,
 displayName: languageModelConfig.displayName,
 },
 } satisfies BlockingChatResponse;
 })
 );
 const response = await askCodebase(parsed.data);

 if (isServiceError(response)) {
 return serviceErrorResponse(response);
 }

 return NextResponse.json(response);
});

const blockStreamUntilFinish = async <T extends UIMessage<unknown, UIDataTypes, UITools>>(stream: ReadableStream<InferUIMessageChunk<T>>) => {
 const reader = stream.getReader();
 while (true as const) {
 const { done } = await reader.read();
 if (done) break;
 }
}
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